Other vendors offer visual representations and better access to what controls are available and how to quickly use them in different scenarios. I cannot find any visual such as http://www.oracle.com/webfolder/technetwork/jet/jetCookbook.html?component=home&demo=all which nicely highlights what each control looks like from an index perspective.
Furthermore, the code in a cookbook should be copy and paste and not have dependencies on hidden helper classes.

Kendo UI pivotgrid should have a way to customize the filters.  Specifically have a date picker for date fields and a date range.  But something so we can override what the default is.

I am trying to use the DropDownList and find this level of documentation:

 <div class="demo-section k-content">
    <h4>Products</h4>
    @(Html.Kendo().DropDownList()
          .Name("products")
          .DataTextField("ProductName")
          .DataValueField("ProductID")
          .DataSource(source => {
              source.Read(read =>
              {
                  read.Action("GetProducts", "Home");
              }); 
          })
          .HtmlAttributes(new { style = "width: 100%" })
    )
</div>

The only other source file is a simple Controller Action method to return a result. There is no indication of what type of data is to be returned by the read.Action("GetProducts", "Home"); 

What fields are required in the data?
What field or fields are passed back to the Controller on Submit?
Is it JSON?
Is it in a wrapper like the Grid uses?

It is issues like this that make ALL the Telerik products difficult to use, and makes me consider using other tools. I think it lowers the value of the tools when Telerik appear to be happy that documentation of this level exists and users have to find answers and working real life examples on sites such as StackOverflow.

We want to create a generic Virtual Kendo DropDownList and use it where ever necessary in the entire project.
For that we would need to know the control id in valuemapper and parametermap. Please give us the access to that.

Thank you!

It would be nice to apply known Excel formatting options to our export cells. For instance, we'd like to be able to rotate a cells content 90 degrees, which Excel allows, but we aren't allowed to add that custom formatting because Kendo's export doesn't handle it.

The option in the Kendo Spreadsheet to show the unmarked values when a filter is applied instead to reset it by pressing the Clear button

It's convenient for users who use older version of Kendo UI

It would bei nice if the gantt would support Auto Height like Grid is doing and is only rendering the Height for the used elements, when you define no addiotional height property.

Splitter bar - animation when collapsing and expanding 
Would enhance a more graceful splitter widgets actions  

Kendo UI Chrome Inspector not finding elements in iframe. if possible there should be provision to select any kendo element from DOM and check kendo UI inspector.

When changing the bounds of a shape, especially changing the X & Y position allow the new value to be set with animation. 

The kendo.drawing.TooltipOptions do not provide a 

show { duration: [time]} 

option that will allow showing the tooltip for a certain duration of time, after which the tooltip will disappear automatically.

Can this be added?

Work like à tree view, but display as an organisation chart to see a company hierachy

Since aggregation causes data to change when using a date axis (new minimums and maximums), provide a way to retrieve the new minimums and maximums for each series plotted on a graph.

Data aggregation is not always desired with date data.  Scatter plots do not work well with dates.  I want to map every point of data I have without having them aggregated in different BaseUnitSteps.

I'd like an option to turn off data aggregation for date series.

Spreadsheet does not have a configuration option for maintaining the scroll position per sheet when scrolling horizontally. Currently spreadsheet maintains the common scrolling position whenever we move different sheets.

It would be nice if you could add a Legend to gauge control with multiple pointers, so it can be easier for users to determine which pointer stands for what. Something like the Legend control on RadHtlmChart, that allows for series to be toggled, except in this case it's the pointers that will need to be toggled.

Add a new control to edit filters/queries like in Visual Studio online (see "How to: Design a Query by Using the Query Designer", https://msdn.microsoft.com/en-us/library/ff852016.aspx)

The idea is that we have dispatchers (classes that fire events) and listeners (classes that listen for events). 

It would be great if I could resize a widget to span multiple columns in the kendo sortable panel demo. 

http://demos.telerik.com/kendo-ui/sortable/sortable-panels