It would be nice if you added an option to actually use combobox in mvvm scenario.
http://www.kendoui.com/forums/ui/combobox/combobox-mvvm-binding-entire-object-instead-of-object-value-mvvm-bug.aspx

Enhance the RTL support because if you check list view control at demo page and click RTL u will see that the pager still not switched rtl 

Kendo UI layout is not working correctly in IE 7

ForeignKey coloumn failed to validation if option label value ("Select value") is selected.

Please render the text labels and checkboxes with the valid markup so that selecting the text gives focus to the related checkbox.

ie.
<span class="editor-field">
  <input type="checkbox" id="treeItem1" value="1">
</span>
<span class="editor-label">
  <label for="treeItem1">Tree Item 1</label>
</span>

Our apps require refresh of the grid's underlying dataset every 15 seconds. By default, this refresh expands all groups. With a couple of enhancements to the grid, we can create a map of collapsed groups and recollapse them after a call to dataSource.data(someNewFreshData). We need two events, groupCollapse and groupExpand. And the k-grouping-row needs a custom data attribute data-k-distinct-values which contains a JSON representation of the array of distinct data values of the current group. For example, if the grid were grouped by state by city by zip, the custom data-k-distinct-values attribute for one of the groups in the grid might contain this hypothetical data: "['California','Beverly Hills','90210']". WIth these complementary enhancements, we'd have all we need to store a map of collapsed groups that we could use to fnd these groups again after a call to dataSource.data(someNewFreshData).  The new data has the same schema as the previously bound dataset.

When a class is added to grid row at runtime to enable so-called conditional styling, which is based on the values in one or more cells  (e.g. if status="urgent" font color=red) and then the grid is grouped by the user, the added class seems to get lost in the shuffle -- it does not "travel" with the row to its new location and so the conditional styling disappears. I'm not sure what goes on behind the scenes during a grouping operation, but if it is possible to preserve custom classes  added at runtime so that they survive the grouping operation, please implement this feature.

Now, we create a confirm window by these code:

$(".exitBtn").click(function(e){
    e.preventDefault();
    var exitWindow = $("<div class='p20 tac' />").kendoWindow({
        title: "exit...",
        resizable: false,
        modal: true
    });
    exitWindow.data("kendoWindow").content($("#exit").html()).center().open();
    exitWindow.find(".confirm,.cancel").click(function() {
        if ($(this).hasClass("confirm")) {
            alert("blabla...");
        }
        exitWindow.data("kendoWindow").close();
    }).end()
});
<script id="exit" type="text/x-kendo-template">
    <p>blabla...</p>
</script>

It's so complicate!!!!!!!!!!
I want to coding in this way:
$(".exitBtn").click(function(){
    $("<div class='p20 tac' />").kendoWindow({
        title: "exit...",
        content: "<p>blabla...</p>",
        resizable: false,
        modal: true,
        center: true,
        okVal: "Exit",
        cancelVal: "I don't",
        ok: function(){
            alert(Exiting...);
        },
        cancel: function(){
            exitWindow.close();
        }
    });
});

KendoUI Grid is awesome!  Everyone who have used it before knows this.  It's true usefulness is when it is paired with server-side paging/filtering/sorting/etc.  

It's power can further be enhanced if it was paired with ElasticSearch to allow for searching and stuff like that.  I'd love to see something that can interface with Elastic Search from the KendoUI team.  Currently we made it ourselves, but it's a huge pain and very hacky.  

Could you please supply Kendo Mobile with two Android themes - black and white. Currently, default iPhone and Android themes are absolutely different, so it requires a big effort to build an application optimized for both iPhone and Android, because you need to optimize colors in you own controls. If you build white Android theme which has  more in common with iPhone theme, it will eliminate the problem.

Add the ability to output the text from the Kendo rich text editor in HTML, XAML, Rich Text or flat text.  

It will be good to make Switch for check box, and some radio button type control available for Web just like you have for Mobile.

When many columns still visible in the grid, but not in the columnMenu, the last columnMenu entry is disabled rather than checking it is the last grid column. 
The method to avoid this is to wait using a timeout() and re-enable all checkboxes in the DOM after the click event, which is not sensitive to which grid the event is occurring as the columnMenu is outside the grid element.

Implement screen boundary detection for the depicted widgets and adjust the popup position to be completely shown in the visible area of the browser.

Telerik has a graphical timepicker control that we're using on desktop applications (WinForms). We'd like something similar for web-apps deployed to our intranet/extranet. The essential features for us are the AM|PM toggle; the display of the 12 hours in several columns and the ability of the developer to define/limit the minutes interval (e.g. 15, 30, 45, 00) in the bottom pane. We are using 15-minute intervals and so the current Kendo dropdown-list timepicker would have to contain 96 items. The Telerik visual approach avoids a long scrolling list:

http://www.telerik.com/products/winforms/editors.aspx#timepicker

Add an Image Properties section to the image manager dialog, similar to the one in RadEditor for ASP.NET AJAX: http://demos.telerik.com/aspnet-ajax/editor/examples/xhtmlvalidatortrackchangesformatcodeblockdialogs/defaultcs.aspx

I need to be able to bind similar to:

  <%= Html.Telerik().TreeView()
                .Name("TreeView")
                .DragAndDrop(settings => settings
                    .DropTargets(".drop-container")
                )
                .ClientEvents(events => events
                    .OnNodeDrop("onNodeDrop")
                )
                .BindTo(Model, mappings =>
                {
                    mappings.For<Employee>(binding => binding
                            .ItemDataBound((item, employee) =>
                            {
                                item.Text = String.Format("{0} {1}", employee.FirstName, employee.LastName);
                                item.ImageUrl = Url.Content("~/Content/TreeView/Common/contact.png");
                                item.Expanded = true;
                            })
                            .Children(employee => employee.Employees));
                })
                .HtmlAttributes(new { @class = "t-group" })
        %>


and have the functionality of sorting, filtering

I sugest new callbacks in scrollview, like before and after callbacks, to made easy create new behaviors, like a carousel with a previous and next buttons.

And update the change callback, when I used the function scrollTo, the change callback isn`t been called.

Allow to customize and define what html attributes to be rendered as part of the LI elements of the navigation widgets.