For the time being the reversed properties can be set through the kendo widget:
		<script>
			function pageLoad(sender, args) {

				var radarChart = $find('<%=RadarLineChart.ClientID%>').get_kendoWidget();
				var polarChart = $find('<%=PolarAreaChart.ClientID%>').get_kendoWidget();


				radarChart.options.valueAxis.reverse = true;
				polarChart.options.yAxis.reverse = true;


				radarChart.options.categoryAxis.reverse = true;
				polarChart.options.xAxis.reverse = true;

				radarChart.redraw();
				polarChart.redraw();
			}
		</script>

		<telerik:RadHtmlChart runat="server" ID="RadarLineChart" Width="345" Height="345">
			<PlotArea>
				<XAxis Reversed="true">
					<Items>
						<telerik:AxisItem LabelText="January"></telerik:AxisItem>
						<telerik:AxisItem LabelText="February"></telerik:AxisItem>
						<telerik:AxisItem LabelText="March"></telerik:AxisItem>
						<telerik:AxisItem LabelText="April"></telerik:AxisItem>
						<telerik:AxisItem LabelText="May"></telerik:AxisItem>
					</Items>
				</XAxis>
				<YAxis Reversed="true">
				</YAxis>
				<Series>
					<telerik:RadarLineSeries Name="Avg Low" MissingValues="Gap">
						<SeriesItems>
							<telerik:CategorySeriesItem Y="1000"></telerik:CategorySeriesItem>
							<telerik:CategorySeriesItem Y="8000"></telerik:CategorySeriesItem>
							<telerik:CategorySeriesItem Y="11000"></telerik:CategorySeriesItem>
							<telerik:CategorySeriesItem Y="13000"></telerik:CategorySeriesItem>
							<telerik:CategorySeriesItem Y="12000"></telerik:CategorySeriesItem>
						</SeriesItems>
					</telerik:RadarLineSeries>
				</Series>
			</PlotArea>
		</telerik:RadHtmlChart>

		<telerik:RadHtmlChart runat="server" ID="PolarAreaChart" Width="345" Height="345">
			<PlotArea>
				<XAxis Reversed="true">
				</XAxis>
				<YAxis Reversed="true">
				</YAxis>
				<Series>
					<telerik:PolarAreaSeries Name=">12.3 knots">
						<SeriesItems>
							<telerik:PolarSeriesItem Angle="125" Radius="2.4"></telerik:PolarSeriesItem>
							<telerik:PolarSeriesItem Angle="138" Radius="7.5"></telerik:PolarSeriesItem>
							<telerik:PolarSeriesItem Angle="152" Radius="8.3"></telerik:PolarSeriesItem>
							<telerik:PolarSeriesItem Angle="166" Radius="4.3"></telerik:PolarSeriesItem>
						</SeriesItems>
					</telerik:PolarAreaSeries>
				</Series>
			</PlotArea>
		</telerik:RadHtmlChart>

JavaScript workaround:
		<telerik:RadHtmlChart runat="server" ID="LineChart" Width="800" Height="500" Transitions="true">
			<PlotArea>
				<Series>
					<telerik:LineSeries Name="Week 15" ZIndex="0">
						<SeriesItems>
							<telerik:CategorySeriesItem Y="15" />
							<telerik:CategorySeriesItem />
							<telerik:CategorySeriesItem Y="71" />
							<telerik:CategorySeriesItem Y="93" />
							<telerik:CategorySeriesItem Y="43" />
							<telerik:CategorySeriesItem Y="23" />
						</SeriesItems>
					</telerik:LineSeries>
				</Series>
			</PlotArea>
		</telerik:RadHtmlChart>
		<script>
			kendo.dataviz.LineChart.fn.animationPoints = function () {
				var series = this.seriesOptions;
				var points = [];
				var seriesPoints;
				var pointsIdx, idx;
				for (idx = 0; idx < series.length; idx++) {
					if (series[idx].markers.visible) {
						seriesPoints = this.seriesPoints[idx];
						for (pointsIdx = 0; pointsIdx < seriesPoints.length; pointsIdx++) {
							if (seriesPoints[pointsIdx] != null) {
								points.push(seriesPoints[pointsIdx].marker);
							}
						}
					}
				}
				return points.concat(this._segments);
			}
		</script>

The workaround is to convert the color names to HEX, for example through the following HexConverter() method:
ASPX:

        <telerik:RadClientExportManager runat="server" ID="RadClientExportManager1">
        </telerik:RadClientExportManager>
        <telerik:RadButton ID="RadButton1" runat="server" OnClientClicked="exportRadHtmlChart" Text="Export RadHtmlChart to PDF" AutoPostBack="false" UseSubmitBehavior="false"></telerik:RadButton>
        <telerik:RadHtmlChart ID="RadHtmlChart1" runat="server" Width="600" Height="400">
            <PlotArea>
                <Series>
                    <telerik:ColumnSeries Name="Series 1" DataFieldY="myValues" ColorField="Color">
                    </telerik:ColumnSeries>
                </Series>
            </PlotArea>
        </telerik:RadHtmlChart>
        <script>
            var $ = $telerik.$;
            function exportRadHtmlChart() {
                $find('<%=RadClientExportManager1.ClientID%>').exportPDF($(".RadHtmlChart"));
            }
        </script>

C#:

    protected void Page_Load(object sender, EventArgs e)
    {
        DataTable dt = GetData();

        for (int i = 0; i < dt.Rows.Count; i++)
        {
            //Not all Color Names can be exported
            // dt.Rows[i]["Color"] = ColorTranslator.ToHtml(GetColor(i));

            //Convert colors to HEX works properly
            dt.Rows[i]["Color"] = HexConverter(GetColor(i));
        }
        RadHtmlChart1.DataSource = dt;
        RadHtmlChart1.DataBind();
    }

    public static DataTable GetData()
    {
        DataTable dt = new DataTable("ChargeData");
        dt.Columns.Add("myValues", typeof(int));
        dt.Columns.Add("Color", typeof(string));


        dt.Rows.Add(11, "");
        dt.Rows.Add(12, "");
        dt.Rows.Add(13, "");
        dt.Rows.Add(14, "");
        dt.Rows.Add(15, "");
        dt.Rows.Add(16, "");
        dt.Rows.Add(17, "");
        dt.Rows.Add(18, "");
        dt.Rows.Add(19, "");
        dt.Rows.Add(20, "");
        return dt;
    }

    public static String HexConverter(System.Drawing.Color c)
    {
        return "#" + c.R.ToString("X2") + c.G.ToString("X2") + c.B.ToString("X2");
    }

    public static Color GetColor(int index)
    {
        return colors[index % colors.Length];
    }

    public static readonly Color[] colors =
    {
        Color.Orange,
        Color.Violet,
        Color.MediumSeaGreen,
        Color.HotPink,
        Color.Black,
        Color.DarkGoldenrod,
        Color.DarkMagenta,
        Color.Chocolate,
        Color.DarkOliveGreen,
        Color.DarkTurquoise
    };

For the time being you can use the following workaround:
1) Either hide the chart with visibility:hidden instead of display:none
2) Or use the following workaround:
		<div id="div1" style="display: none;">
			<telerik:RadHtmlChart runat="server" ID="ColumnChart1" Width="600px" Height="400px">
				<PlotArea>
					<Series>
						<telerik:ColumnSeries Name="Product 1">
							<SeriesItems>
								<telerik:CategorySeriesItem Y="1" />
								<telerik:CategorySeriesItem Y="2" />
								<telerik:CategorySeriesItem Y="3" />
							</SeriesItems>
						</telerik:ColumnSeries>
					</Series>
				</PlotArea>
			</telerik:RadHtmlChart>
		</div>
		<input type="button" onclick="showChart(); return false;" value="Show Chart" />
		<script>
			Telerik.Web.UI.RadHtmlChart.prototype._getMainConfig = function () {
				var that = this;
				//when visible is false - nothing is sent from the server to save transferred data
				//e.g - there are properties set but visible is false - we do not need to send those properties amyway
				//that is why - set visible: false when nothing is sent from the server
				that._options = $telerik._getPropertiesParameter(that, that.constructor);
				that._cleanUpConfigProperties();

				that._options["theme"] = that.get_skin();
				//that._options["visible"] = $(that.get_element()).is(':visible');
				that._options["title"] = that._chartTitle ? that._parseObject(that._chartTitle) : { visible: false };
				that._options["legend"] = that._legend ? that._parseObject(that._legend) : { visible: false };

				if (that._chartArea) {
					that._options["chartArea"] = that._parseObject(that._chartArea);
				}

				if (that._isSparklineChart()) {
					that._setMinimumSparklineWidth();
				}

				if (that._plotArea) {
					that._configurePlotArea();
				}

				if (that._series) {
					/*jshint evil: true */
					that._options["series"] = eval(that._series);
					/*jshint evil: false */
				}

				if (that._isStockChart()) {
					that._configureStockChart();
				}
			}
		</script>

A possible workaround: 
	<form id="form1" runat="server">
		<telerik:RadScriptManager ID="RadScriptManager1" runat="server"></telerik:RadScriptManager>
		<script>
			var ExplodeLevel = 0.15;
		</script>
		<telerik:RadHtmlChart runat="server" ID="PieChart1" Transitions="true">
			<PlotArea>
				<Series>
					<telerik:PieSeries StartAngle="90">
						<LabelsAppearance Position="OutsideEnd" DataFormatString="{0} %" />
						<TooltipsAppearance DataFormatString="{0} %" />
						<SeriesItems>
							<telerik:PieSeriesItem BackgroundColor="Purple" Exploded="true" Name="Internet Explorer" Y="18.3" />
							<telerik:PieSeriesItem BackgroundColor="Orange" Exploded="false" Name="Firefox" Y="35.8" />
							<telerik:PieSeriesItem BackgroundColor="Green" Exploded="false" Name="Chrome" Y="38.3" />
							<telerik:PieSeriesItem BackgroundColor="Blue" Exploded="true" Name="Safari" Y="4.5" />
							<telerik:PieSeriesItem BackgroundColor="Red" Exploded="false" Name="Opera" Y="2.3" />
						</SeriesItems>
					</telerik:PieSeries>
				</Series>
			</PlotArea>
			<ChartTitle Text="Browser Usage for April 2012">
			</ChartTitle>
		</telerik:RadHtmlChart>
		<script>
			var math = Math,
				dataviz = kendo.dataviz,
				Box2D = dataviz.Box2D,
				Point2D = dataviz.Point2D,
				OUTSIDE_END = "outsideEnd",
				RIGHT = "right",
				util = kendo.util,
				valueOrDefault = util.valueOrDefault;

			kendo.dataviz.PieChart.fn.reflow = function (targetBox) {
				var chart = this,
					options = chart.options,
					box = targetBox.clone(),
					space = 5,
					minWidth = math.min(box.width(), box.height()),
					halfMinWidth = minWidth / 2,
					defaultPadding = minWidth - minWidth * 0.85,
					padding = valueOrDefault(options.padding, defaultPadding),
					newBox = Box2D(box.x1, box.y1,
					box.x1 + minWidth, box.y1 + minWidth),
					newBoxCenter = newBox.center(),
					seriesConfigs = chart.seriesConfigs || [],
					boxCenter = box.center(),
					points = chart.points,
					count = points.length,
					seriesCount = options.series.length,
					leftSideLabels = [],
					rightSideLabels = [],
					seriesConfig, seriesIndex, label,
					segment, sector, r, i, c;

				padding = padding > halfMinWidth - space ? halfMinWidth - space : padding;
				newBox.translate(boxCenter.x - newBoxCenter.x, boxCenter.y - newBoxCenter.y);
				r = halfMinWidth - padding;
				c = Point2D(
					r + newBox.x1 + padding,
					r + newBox.y1 + padding
				);

				for (i = 0; i < count; i++) {
					segment = points[i];

					sector = segment.sector;
					sector.r = r;
					sector.c = c;
					seriesIndex = segment.seriesIx;
					if (seriesConfigs.length) {
						seriesConfig = seriesConfigs[seriesIndex];
						sector.ir = seriesConfig.ir;
						sector.r = seriesConfig.r;
					}

					if (seriesIndex == seriesCount - 1 && segment.explode) {
						sector.c = sector.clone().radius(sector.r * ExplodeLevel).point(sector.middle());
					}

					segment.reflow(newBox);

					label = segment.label;
					if (label) {
						if (label.options.position === OUTSIDE_END) {
							if (seriesIndex == seriesCount - 1) {
								if (label.orientation === RIGHT) {
									rightSideLabels.push(label);
								} else {
									leftSideLabels.push(label);
								}
							}
						}
					}
				}

				if (leftSideLabels.length > 0) {
					leftSideLabels.sort(chart.labelComparator(true));
					chart.leftLabelsReflow(leftSideLabels);
				}

				if (rightSideLabels.length > 0) {
					rightSideLabels.sort(chart.labelComparator(false));
					chart.rightLabelsReflow(rightSideLabels);
				}

				chart.box = newBox;
			};
		</script>
	</form>

For the time being you can use the following workaround:

        <telerik:RadScriptManager ID="RadScriptManager1" runat="server"></telerik:RadScriptManager>
        <script>
            function pageLoad() {
                var position = 'insideEnd'; // 'center'
                $find("<%=PieChart1.ClientID%>")._chartObject.options.series[0].labels.position = position;
                $find("<%=PieChart1.ClientID%>")._chartObject.options.series[0].labels.distance = -20;
                $find("<%=PieChart1.ClientID%>")._chartObject.redraw();
            }
        </script>
        <telerik:RadHtmlChart runat="server" ID="PieChart1" Transitions="true">
            <PlotArea>
                <Series>
                    <telerik:PieSeries StartAngle="90">
                        <LabelsAppearance DataFormatString="{0} %" />
                        <TooltipsAppearance DataFormatString="{0} %" />
                        <Items>
                            <telerik:SeriesItem BackgroundColor="Purple" Exploded="true" Name="Internet Explorer" YValue="18.3" />
                            <telerik:SeriesItem BackgroundColor="Orange" Exploded="false" Name="Firefox" YValue="35.8" />
                            <telerik:SeriesItem BackgroundColor="Green" Exploded="false" Name="Chrome" YValue="38.3" />
                            <telerik:SeriesItem BackgroundColor="Blue" Exploded="false" Name="Safari" YValue="4.5" />
                            <telerik:SeriesItem BackgroundColor="Red" Exploded="false" Name="Opera" YValue="2.3" />
                        </Items>
                    </telerik:PieSeries>
                </Series>
            </PlotArea>
            <ChartTitle Text="Browser Usage for April 2012">
            </ChartTitle>
        </telerik:RadHtmlChart>
        <script>
            var INSIDE_END = "insideEnd",
                CENTER = "center",
                LEFT = "left",
                RIGHT = "right",
                dataviz = kendo.dataviz,
                Box2D = dataviz.Box2D,
                math = Math;

            kendo.dataviz.PieSegment.fn.reflowLabel = function () {
                var segment = this,
                    sector = segment.sector.clone(),
                    options = segment.options,
                    label = segment.label,
                    labelsOptions = options.labels,
                    labelsDistance = labelsOptions.distance,
                    angle = sector.middle(),
                    lp, x1, labelWidth, labelHeight;

                if (label) {
                    labelHeight = label.box.height();
                    labelWidth = label.box.width();
                    if (labelsOptions.position == CENTER) {
                        sector.r = math.abs((sector.r - labelHeight) / 2) + labelHeight + labelsDistance;
                        lp = sector.point(angle);
                        label.reflow(Box2D(lp.x, lp.y - labelHeight / 2, lp.x, lp.y));
                    } else if (labelsOptions.position == INSIDE_END) {
                        sector.r = sector.r - labelHeight / 2 + labelsDistance;
                        lp = sector.point(angle);
                        label.reflow(Box2D(lp.x, lp.y - labelHeight / 2, lp.x, lp.y));
                    } else {
                        lp = sector.clone().expand(labelsDistance).point(angle);
                        if (lp.x >= sector.c.x) {
                            x1 = lp.x + labelWidth;
                            label.orientation = RIGHT;
                        } else {
                            x1 = lp.x - labelWidth;
                            label.orientation = LEFT;
                        }
                        label.reflow(Box2D(x1, lp.y - labelHeight, lp.x, lp.y));
                    }
                }
            }
        </script>

For the time being you can resize the chart with set_width/set_height methods. For example:

<head runat="server">
	<title></title>
	<style>
		.RadHtmlChart.k-chart, table {
			width: 100%;
			height: 100%;
		}

		td {
			border: 1px solid green;
			width: 60%;
			height: 60%;
			overflow:hidden;
		}

		html, body, form {
			height: 100%;
			overflow: hidden;
			margin: 0;
		}
	</style>
</head>
<body>
	<form id="form1" runat="server">
		<telerik:RadScriptManager ID="RadScriptManager1" runat="server"></telerik:RadScriptManager>
		<script>
			function resizedw() {
				// Haven't resized in 100ms!
				var donut = $find("<%=DonutChart.ClientID%>");
				var radar = $find("<%=RadarAreaChart.ClientID%>");

				var docDimensions = $telerik.getBounds(document.body);
				resizeChart(donut, docDimensions);
				resizeChart(radar, docDimensions);
			}

			function resizeChart(chart, docDimensions) {
				var chartDimensions = $telerik.getBounds(chart.get_element().parentElement);
				chart.set_width("'" + (chartDimensions.width / docDimensions.width) + "%'");
				chart.set_height(("'" + chartDimensions.height / docDimensions.height) + "'%");
			}

			var doit;
			window.onresize = function () {
				clearTimeout(doit);
				doit = setTimeout(resizedw, 1000);
			};
		</script>
		<table>
			<tr>
				<td>
					<telerik:RadHtmlChart runat="server" ID="DonutChart" Width="100%" Height="100%" Transitions="true">
						<Appearance>
							<FillStyle BackgroundColor="White"></FillStyle>
						</Appearance>
						<ChartTitle Text="OS Usage Statistics for December 2012">
							<Appearance Align="Center" Position="Top"></Appearance>
						</ChartTitle>
						<PlotArea>
							<Series>
								<telerik:DonutSeries>
									<LabelsAppearance Visible="false">
									</LabelsAppearance>
									<TooltipsAppearance DataFormatString="{0}%" BackgroundColor="White"></TooltipsAppearance>
									<SeriesItems>
										<telerik:PieSeriesItem BackgroundColor="#00adcc" Name="Win7"
											Y="55.6"></telerik:PieSeriesItem>
										<telerik:PieSeriesItem BackgroundColor="#cccccc" Name="Win8" Y="2.5"></telerik:PieSeriesItem>
										<telerik:PieSeriesItem BackgroundColor="#999999" Name="Vista" Y="2.8"></telerik:PieSeriesItem>
										<telerik:PieSeriesItem BackgroundColor="#888888" Name="NT" Y="1.8"></telerik:PieSeriesItem>
										<telerik:PieSeriesItem BackgroundColor="#777777" Name="WinXP" Y="21.1"></telerik:PieSeriesItem>
										<telerik:PieSeriesItem BackgroundColor="#666666" Name="Linux" Y="4.7"></telerik:PieSeriesItem>
										<telerik:PieSeriesItem BackgroundColor="#555555" Name="Mac" Y="8.7"></telerik:PieSeriesItem>
										<telerik:PieSeriesItem BackgroundColor="#444444" Name="Mobile" Y="2.2"></telerik:PieSeriesItem>
									</SeriesItems>
								</telerik:DonutSeries>
							</Series>
						</PlotArea>
					</telerik:RadHtmlChart>
				</td>
				<td>
					<telerik:RadHtmlChart runat="server" ID="RadarAreaChart" Width="100%" Height="100%" Transitions="true">
						<PlotArea>
							<Series>
								<telerik:RadarAreaSeries Name="Position" MissingValues="Gap">
									<Appearance>
										<FillStyle BackgroundColor="#00adcc"></FillStyle>
									</Appearance>
									<LineAppearance Width="1" />
									<MarkersAppearance Visible="false" />
									<LabelsAppearance Visible="false"></LabelsAppearance>
									<SeriesItems>
										<telerik:CategorySeriesItem Y="159"></telerik:CategorySeriesItem>
										<telerik:CategorySeriesItem Y="170"></telerik:CategorySeriesItem>
										<telerik:CategorySeriesItem Y="100"></telerik:CategorySeriesItem>
										<telerik:CategorySeriesItem Y="140"></telerik:CategorySeriesItem>
										<telerik:CategorySeriesItem Y="160"></telerik:CategorySeriesItem>
										<telerik:CategorySeriesItem Y="103"></telerik:CategorySeriesItem>
										<telerik:CategorySeriesItem Y="173"></telerik:CategorySeriesItem>
										<telerik:CategorySeriesItem Y="107"></telerik:CategorySeriesItem>
									</SeriesItems>
								</telerik:RadarAreaSeries>
								<telerik:RadarAreaSeries Name="Person" MissingValues="Gap">
									<Appearance>
										<FillStyle BackgroundColor="red"></FillStyle>
									</Appearance>
									<LabelsAppearance Visible="false">
									</LabelsAppearance>
									<LineAppearance Width="1" />
									<MarkersAppearance Visible="false"></MarkersAppearance>
									<SeriesItems>
										<telerik:CategorySeriesItem Y="130"></telerik:CategorySeriesItem>
										<telerik:CategorySeriesItem Y="160"></telerik:CategorySeriesItem>
										<telerik:CategorySeriesItem Y="130"></telerik:CategorySeriesItem>
										<telerik:CategorySeriesItem Y="168"></telerik:CategorySeriesItem>
										<telerik:CategorySeriesItem Y="150"></telerik:CategorySeriesItem>
										<telerik:CategorySeriesItem Y="140"></telerik:CategorySeriesItem>
										<telerik:CategorySeriesItem Y="109"></telerik:CategorySeriesItem>
										<telerik:CategorySeriesItem Y="76"></telerik:CategorySeriesItem>
									</SeriesItems>
								</telerik:RadarAreaSeries>
							</Series>
							<XAxis Color="Black" Reversed="false" StartAngle="180">
								<MajorGridLines Color="#EFEFEF" Width="1"></MajorGridLines>
								<MinorGridLines Visible="false"></MinorGridLines>
								<Items>
									<telerik:AxisItem LabelText="Soft Skills"></telerik:AxisItem>
									<telerik:AxisItem LabelText="Sector knowledge"></telerik:AxisItem>
									<telerik:AxisItem LabelText="Finance knowledge"></telerik:AxisItem>
									<telerik:AxisItem LabelText="Work experience"></telerik:AxisItem>
									<telerik:AxisItem LabelText="Win7 skills"></telerik:AxisItem>
									<telerik:AxisItem LabelText="MS Office skills"></telerik:AxisItem>
									<telerik:AxisItem LabelText="Programming skills"></telerik:AxisItem>
									<telerik:AxisItem LabelText="Database skills"></telerik:AxisItem>
								</Items>
							</XAxis>
							<YAxis Visible="false">
								<MajorGridLines Color="#EFEFEF" Width="1"></MajorGridLines>
								<MinorGridLines Visible="false"></MinorGridLines>
								<LabelsAppearance Step="1"></LabelsAppearance>
							</YAxis>
							<CommonTooltipsAppearance Color="White"></CommonTooltipsAppearance>
						</PlotArea>
						<ChartTitle Text="Position Profile">
							<Appearance Align="Center" BackgroundColor="White" Position="Top">
							</Appearance>
						</ChartTitle>
						<Legend>
							<Appearance BackgroundColor="White" Position="Bottom">
							</Appearance>
						</Legend>
					</telerik:RadHtmlChart>
				</td>
			</tr>
		</table>
	</form>

The chart's labels also look misaligned in rtl direction, so you can change only chart's direction to ltr with CSS:
	<style>
		.RadHtmlChart {
			direction: ltr;
		}
	</style>

		<div dir="rtl">
			some text
		<telerik:RadHtmlChart ID="RadHtmlChart1" runat="server" Width="600" Height="400">
			<PlotArea>
				<Series>
					<telerik:ColumnSeries Name="Series 1">
						<SeriesItems>
							<telerik:CategorySeriesItem Y="30" />
							<telerik:CategorySeriesItem Y="10" />
							<telerik:CategorySeriesItem Y="20" />
						</SeriesItems>
					</telerik:ColumnSeries>
				</Series>
				<XAxis>
					<LabelsAppearance RotationAngle="33"></LabelsAppearance>
					<Items>
						<telerik:AxisItem LabelText="Item 1" />
						<telerik:AxisItem LabelText="Item 2" />
						<telerik:AxisItem LabelText="Item 3" />
					</Items>
				</XAxis>
			</PlotArea>
		</telerik:RadHtmlChart>
		</div>

allow for the chart plot area to be fixed width not counting the axis text. the issue I have is the legend on right side of chart changes the widths of chart when the text is long.

A visual example - http://i.stack.imgur.com/zRwlo.jpg

The feature will be useful for projects that need 508 compliance.

A boolean properties will also be useful: "EnabledTexturedFill", "EnableColorAndTexturedFill"

I would like to suggest ability to display data series in doughnut and pie charts, see attached example from Excel.

And thanks for a great Telerik experience, you make my development work very easy.

For the time being you can use a JavaScript function inside the template to cut the labels - http://docs.telerik.com/kendo-ui/dataviz/chart/how-to/shorten-chart-labels

Reproduction steps - Run the code below and click Show Chart - chart is not displayed.
ASPX:
		<div id="div1" style="visibility: hidden;">
			<telerik:RadHtmlChart runat="server" ID="ColumnChart1" Width="600px" Height="400px">
				<PlotArea>
					<Series>
						<telerik:ColumnSeries Name="Product 1">
							<SeriesItems>
								<telerik:CategorySeriesItem Y="1" />
								<telerik:CategorySeriesItem Y="2" />
								<telerik:CategorySeriesItem Y="3" />
							</SeriesItems>
						</telerik:ColumnSeries>
					</Series>
				</PlotArea>
			</telerik:RadHtmlChart>
		</div>
		<div id="chart" style="visibility: hidden;">HtmlChart wrapper</div>
		<input type="button" onclick="showChart(); return false;" value="Show Chart" />
		<script>
			$ = $telerik.$;
			function showChart() {
				$("#div1").attr("style", "visibility:visible");
			}
		</script>
Solution 1:
Use the workaround below:
		<telerik:RadRotator ID="RadRotator1" runat="server" Height="500px" ItemHeight="300px" ItemWidth="300px" Skin="Default" Width="1000px" RotatorType="AutomaticAdvance">
			<Items>
				<telerik:RadRotatorItem>
					<ItemTemplate>
						<telerik:RadHtmlChart ID="RadHtmlChart2" runat="server" Height="300px" Skin="Silk" Width="300px" Transitions="False" Visible="true">
							<PlotArea>
								<Series>
									<telerik:PieSeries>
										<SeriesItems>
											<telerik:PieSeriesItem Name="a" Y="12" />
											<telerik:PieSeriesItem Name="b" Y="5" />
										</SeriesItems>
									</telerik:PieSeries>
								</Series>
							</PlotArea>
						</telerik:RadHtmlChart>
					</ItemTemplate>
				</telerik:RadRotatorItem>
			</Items>
			<ItemTemplate>
			</ItemTemplate>
		</telerik:RadRotator>
		<script>
			$ = $telerik.$;
			Telerik.Web.UI.RadHtmlChart.prototype.repaint = function () {
				var that = this;
				if (that._chartObject) {
					if (that._isDataSourceChanged()) {
						that._loadData();
					}
					else {
						that._resetVisibilityOption();
						that._chartObject.redraw();
					}
				}
			};

			Telerik.Web.UI.RadHtmlChart.prototype._resetVisibilityOption = function () {
				var that = this;
				that._chartObject.options.visible = that._options.visible = that.get_visible();
			};

			Telerik.Web.UI.RadHtmlChart.prototype._getMainConfig = function () {
				var that = this;
				//when visible is false - nothing is sent from the server to save transferred data
				//e.g - there are properties set but visible is false - we do not need to send those properties amyway
				//that is why - set visible: false when nothing is sent from the server
				that._options = $telerik._getPropertiesParameter(that, that.constructor);
				that._cleanUpConfigProperties();

				that._options["theme"] = that.get_skin();
				that._options["visible"] = $(that.get_element()).is(':visible');
				that._options["title"] = that._chartTitle ? that._parseObject(that._chartTitle) : { visible: false };
				that._options["legend"] = that._legend ? that._parseObject(that._legend) : { visible: false };

				if (that._chartArea) {
					that._options["chartArea"] = that._parseObject(that._chartArea);
				}

				if (that._isSparklineChart()) {
					that._setMinimumSparklineWidth();
				}

				if (that._plotArea) {
					that._configurePlotArea();
				}

				if (that._series) {
					/*jshint evil: true */
					that._options["series"] = eval(that._series);
					/*jshint evil: false */
				}

				if (that._isStockChart()) {
					that._configureStockChart();
				}
			};
		</script>
Solution 2:
Hide the chart on load event:
		<div id="div1">
			<telerik:RadHtmlChart runat="server" ID="ColumnChart1" Width="600px" Height="400px">
				<ClientEvents OnLoad="OnLoad" />
				<PlotArea>
					<Series>
						<telerik:ColumnSeries Name="Product 1">
							<SeriesItems>
								<telerik:CategorySeriesItem Y="1" />
								<telerik:CategorySeriesItem Y="2" />
								<telerik:CategorySeriesItem Y="3" />
							</SeriesItems>
						</telerik:ColumnSeries>
					</Series>
				</PlotArea>
			</telerik:RadHtmlChart>
		</div>
		<div id="chart" style="visibility: hidden;">HtmlChart wrapper</div>
		<input type="button" onclick="showChart(); return false;" value="Show Chart" />
		<script>
			$ = $telerik.$;
			function showChart() {
				$("#div1").attr("style", "visibility:visible");
			}

			function OnLoad() {
				$("#div1").attr("style", "visibility:hidden");
			}

		</script>

For the time being you can manually fetch the data and pass it to the chart:
		<script>
			function pageLoad() {
				var dataSource = $find('<%= RadClientDataSource1.ClientID %>');
				dataSource.fetch(function (args) {
					var data = args.get_data(),
						chart = $find('<%=RadHtmlChart1.ClientID%>');
					//workaround
					chart.set_dataSource(data);
					chart.repaint();
				});
			}
		</script>
		<telerik:RadClientDataSource ID="RadClientDataSource1" runat="server">
			<DataSource>
				<WebServiceDataSourceSettings>
					<Select Url="spain-electricity.json" DataType="JSON" />
				</WebServiceDataSourceSettings>
			</DataSource>
			<Schema>
				<Model>
					<telerik:ClientDataSourceModelField FieldName="year" DataType="String" />
					<telerik:ClientDataSourceModelField FieldName="solar" DataType="Number" />
				</Model>
			</Schema>
		</telerik:RadClientDataSource>

		<telerik:RadHtmlChart ID="RadHtmlChart1" runat="server" ClientDataSourceID="RadClientDataSource1">
			<PlotArea>
				<Series>
					<telerik:LineSeries DataFieldY="year" Name="year">
					</telerik:LineSeries>
				</Series>
				<XAxis DataLabelsField="year"></XAxis>
			</PlotArea>
		</telerik:RadHtmlChart>