Add a control similar to the one found here:
http://demo.aspnetawesome.com/LookupDemo/Index

I believe that all the components needed to create this control already exist, then it would suffice to encapsulate in a single control (plus a template for the form of research)

It would be something similar to edit popup already exists for the grid, except that would be linked to a texbox (or dropdownlist)

Currently if you use a DropDownList in a mobile app, the picker popup is changed to an ActionSheet automatically. This may work well for phone-based applications but when creating tablet-based apps, this can be a clumsy and less than ideal selection presentation. Please allow for some configuration option to all the DropDownList to use its normal browser behavior even when running in  mobile application. Referenced here: http://www.kendoui.com/forums/kendo-ui-web/combobox/prevent-actionsheet-selection-in-mobile-app.aspx

I would like to have a chart like circular progress chart that use in lots of infographic diagram like the one below.

http://stackoverflow.com/questions/11202920/circular-radial-progress-bar

I managed to make it work by doing some manipulation to the donut chart like the one below that look similar to it but I believe the Kendo team can come up a better one and more reusable.

http://eswkchartdemo.azurewebsites.net/Dataviz/RealtimeDonutChart

Support for injecting some custom header information in the export PDF and Excel? 

e.g. You are exporting some grid to excel or pdf and you want do display the search parameters in the header of the document.

Locked columns can only be on one side of the Grid.
In Kendo Grid, is it possible to have locked columns on the left and right side.
For Eg: my grid has like 20 columns and i want to lock first few columns to the left side and also lock the custom commands column on the right side of the grid.

When using a grid against a large table with server side filtering (ToDataSourceResult)

ToDataSourceResult builds a SQL query that converts the search string to UPPER() and therefore prevents the database from using its indexes. As SQL comparison is case insensitive that LOWER() is unnecessary.  

As we have may grids where this is an issue it would be time consuming to build out manual filters for each grid instead of using ToDataSourceResult

This was discussed here and there was no solution at the time:

https://www.telerik.com/forums/grid-filtering-on-text-using-lower-in-sql

I would liek to request an option to tell ToDataSourceResult() not to use LOWER() in the sql?

See ticket #1339310

I'm seeing an error in the Chrome console when the filter menu is clicked on in a kendo grid: https://demos.telerik.com/kendo-ui/grid/filter-menu-customization

You can see the example in the link above by opening your console in Chrome and clicking on the filter button. 

Here is the error:

Blocked aria-hidden on a <a> element because the element that just received focus must not be hidden from assistive technology users. Avoid using aria-hidden on a focused element or its ancestor. Consider using the inert attribute instead, which will also prevent focus. For more details, see the aria-hidden section of the WAI-ARIA specification at https://w3c.github.io/aria/#aria-hidden.

Add extensions for templating engines such as JADE, HAML, or JQuery Templates, so Kendo UI can be built from VIEW files in MVC frameworks such as Express or Kanso on NodeJS.

We find with lots of UI vendors put up cool demos, but rarely a more realistic view. We like to see the controls in a LOB style layout with:
1. A Purchase order where you enter PO#, Date, Customer (Autocomplete), Customer Name (as result of autocomplete select), ShipToCountry.
2. Order lines (grid or other) with ProductID (autocomplete which then populates description and price), Quantity (which in turn calculates line price).
3. As a result of ajax submit, the server side validation returns error saying order value exceeds customer limit AND ShipCountry not valid for this customer. So the form displays message "Exceeds customer limit" and ShipToCountry input is highlighted with error message "Not valid for this customer".

And make it look good!

Similar to jquery mobile, it would be useful to handle below events
- touch (with fingers, directions)
- tap
- tap hold
- swipe (left / right)

Could you guys add normal user controls like a dropdown list on the mobile framework. On the android the <select> element does not work. It's grayed out?

Add spell checker to the new Rich Text Editor similar to the other Telerik Editors.

Provide context menu support for treeview. At least provide mouse click handlers for treeview.
Also how to add items with id from datasource in treeview. You have API to select via item id, but nothing that adds id via datasource.

How about a easy way to build reports like invoices, labels, etc?

http://www.telerik.com/help/silverlight/radexpressioneditor-overview.html

Slider seems to only output numbers, I want to use it for date ranges, ala mint.com.

This bug is visible in your demo at http://demos.kendoui.com/web/grid/editing.html.

When using a scrollable, editable grid in IE (9 or below):
•	Scroll down so that the first row of the grid is no longer visible.
•	Click on any row.
•	The grid jumps back up to the original "unscrolled" position. (In your demo, on my screen, this means that only the first 10 rows are visible.)
The result is that I am unable to edit any row outside the first 10, unless I use the keyboard to navigate.
This does not occur in Firefox, Chrome, Opera, or Safari - only in IE.