For Kendo UI, it would be great if you could add a kendo configuration to a Model's field which would be used to auto display the html component, here is an example:

var newModel = kendo.data.Model.define({
  id: "id",
  fields: {
    state: {
      type: "string",
      defaultValue: "",
      validation: { required: true },
      component: {
        role: "kendoDropDownList",
        dataSource: {
          data: [
            'Alabama',
            'Alaska',
            'Arizona'
          ]
        }
      }
    }
  }
});

Although Kendo has fency filters with different operators (StartsWith, Contains) on different columns based on data type, Most business users  like to have excel AutoFilter(Multi select checkbox) where they can choose what companies, countries they want to see

You can see a live demo here at - select company, country or any other column.
http://demos.devexpress.com/MVC/GridView/Filtering

You can put multiple inputs in a custom Grid cell editor (textboxes, checkboxes, etc.), but since there's more than 1 and the grid doesn't support binding to arrays/collections out of the box, there's no way to automatically get those values into a model when you move away from the cell. The grid "save" event doesn't fire when there isn't 1 input using "data-bind".
You can put a button or something to click on inside the cell and then in the click event update the model yourself, but that looks odd.
Please add a cell-closing event that allows us to manually update the model or do other clean-up.
OR, please add support for binding to arrays for a field in the grid.
Thanks. 

Kendo UI Tree List control currently does not support column resize and frozen columns. The former prevents us from using it as our end users will not be able to resize the columns when the tree list columns are localized.

Allow the user to resize the editor textarea by dragging the lower right corner. A solution for doing this is given in the forums, but it would be great to have it as built-in functionality.
http://www.kendoui.com/forums/kendo-ui-complete-for-asp-net-mvc/editor/is-it-possible-to-give-the-html-editor-a-resize-grip-.aspx

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.

When window resize , detect all components in it and resize 

When creating a multilingual website I've realized, non-English unicode characters are not supported by the Grid's toolbar buttons. The toolbar won't be created and the Grid's setup cancelled. So, also no read function called or anything else.
Strangely it also killed the functionality of my Razor DropDownList for language selection despite no connection other than both using JavaScript.

Some users prefer larger font sizes than what is default in kendo. We have added an option for setting the default font size in our product, but when we do that some of the widgets brake because they did size calculations on init that is affected by font size changes.

We currently have to reload the entire page as a workaround, but that does not offer the user a smooth experience when changing the font size. At minimum, all widgets should support a resize method that we could trigger such that the widgets could recalculate all required sizes.

Can we have an option where the TabStrip tabs overflow to a dropdown just like the ToolBar items overflow when re-sized instead of wrapping tab items to another line

This would work great on small factor tablets/phones

There are as many real world situations where one needs to display Heterogeneous Hierarchical Data such as web services where the returned data has complex data types consisting different simple type data or list.

Kendo Grid Row Filters inputs use autocomplete by default. Because of this the data source is queried on every keystroke in the auto complete. This causes unacceptable performance issues with a large/complex server side data source. I suggest adding a configuration to turn this off, which would cause the data source to only be queried on an enter keystroke.

I do not understand why Telerik is releasing a client-side only version of their controls.  Why are not the ASP.Net Ajax components generate html5 controls like the Kendo UI one? 

I would like the controls that I bought (ASP.Net Ajax) to adapt to the world, this is the reason why we first bought them (to avoid taking care of writing client-side interface over and over again and technology progress).

Please integrate KendoUI to Telerik server controls.

Thanks.

Currently if you append or insert to an object that uses a datasource (such as grid or treeview), none of the existing entires will have the template applied. This is a major problem and should be resolved ASAP.

I have a very simple chart, with date category axis, 2 series with just 2 values (two days). I set rotation for labels on a category axis to 45.
When any "label" in a legend is clicked, the labels disappear.
This problem appears only if rotation is set to 45. I have tried to set rotation to 40 or 90 - both are just fine. But rotation 45 seems to be broken.

It's great having the tsd files as part of the full download.
It would even be better if you could submit a pull request to the DefinitelyTyped github repo https://github.com/borisyankov/DefinitelyTyped , as that would allow us to integrate Kendo UI documentation in JavaScript projects out of the box.

This repo is used by the npm tool "tsd", which allows for really easy automation of the downloading and updating of tsd files.

This would be akin to the bower dependency that you already submitted for kendo.core.
more info here: http://definitelytyped.org/

Thanks,

Jaume

make a widget like the asp.net Details View control. 
This displays the details of a single row from a grid in 2 columns. The Left Hand column has the field labels, the RH column has the values. 

We have a use case where we are using ContextMenu with the following configuration:
showOn 'click'
alignToAnchor  true, 

Anchor being a button and on click of the button, context menu opens but the focus doesn't shift to it and remains still with the button.