For example; similar to http://www.highcharts.com/stock/demo/arearange

Having area 'scatter' support, such as 'scatterArea', and 'scatterAreaRange', like the existing 'scatterLine', is also desirable.

To define reusable parts of an application, developer often needs to define a model for the data, and a template for the presentation.

UserControl may systemize and simplify this activity.
Please look at the following links for details:

http://www.nesterovsky-bros.com/weblog/2013/03/26/KendoUIUserControl.aspx

http://www.nesterovsky-bros.com/weblog/2013/04/03/KendoUIExtendedModel.aspx

http://www.nesterovsky-bros.com/weblog/2013/05/18/KendoUIControlsjs.aspx

http://www.nesterovsky-bros.com/download/KendoUI/scripts/controls.js

I will try to explain the functionality I am looking for a little better. Suppose I have a tabstrip with 3 pages.  Page A, B and C. Page C is an info page and doesn't have sub pages, but Page A and B have a button (or listview) to navigate to a sub page (view) of page A (A-sub) and B (B-sub).

Desired behaviour (IMHO):
Example 1:
When I start the App, it will always show page A. I can click on the Icon for page B to navigate to page B and then click page C to navigate to page C. Now (when I am still on page C) I click the back-button, the app navigates back to page B and when I click the back-button again, I will then navigate from page B to page A. In my example (and in the apps I so far have been working on), I consider the tabs (pages) on the tablist as a menu and when I click the back button I don't want to go to a previous visited page, but I want to exit (with or without warning) the app.

Example 2:
Now I start again, still on page A of course. On page A I have a button that navigates me to a sub page (A-sub). I click the button and the sub-page shows. When I click the back button I want me app to navigate back to page A from sub-A. When I click the back button on page A again, I want to leave the app.

Example 3:
Start the App and page A shows. I click the tab to navigate to page B. On page B there is a list with product categories. I click one of the categories which makes me go to B-sub where the products for that category are shown. Clicking the back button would bring me back to page B. Another back-click would allow me to exit the app.

Example 4 (the last one):
Start the App and page A shows. I click the tab to navigate to page B. On page B there is a list with product categories. I click one of the categories which makes me go to B-sub where the products for that category are shown. Now I click the tab for page A, which makes me navigate to page A. Clicking the back-button this time would ask me to exit the App.

In short: I see the pages belonging to the pages on the tabstrip as parent pages. When one of these pages is currently shown, the back button should close the app. No matter what previous navigation you have done. When on a child  page (navigated from a parent page) and clicking the back-button (either hardware or software) will make you go back to it's parent page.

I can vaguely imagine reasons to rolls your own event binding functions for your widgets, but the lack of parity with the standard jquery bind() is frustrating. 

At the VERY least it should support namespaces so one can unbind without having to re-pass the handler to unbind. It can make for unnecessarily messy code.

It would be great to have a Widget that allows you to bind keyboard short cuts to a normal HTML element such as a Button or really an other element.

Additionally upon init, this widget would check for conflicts against other shortcuts provided by Kendo UI and provide the developer an exception explaining the conflict.

CKEditor provides the "Insert Template" feature which gives the user the ability to design/create HTML Templates, add it to the toolbar menu, and reuse them. Please see the CKEditor documentation below for reference:

1. http://ckeditor.com/about/features#user-rich-content (see "Templates" on the right)

2. http://docs.ckeditor.com/#!/api/CKEDITOR.template

3. http://ckeditor.com/addon/templates

This will be a tremendous addition to the Editor, giving us the ability to create special-purpose HTML snippets, add them to the toolbar, and reuse them throughout (e.g., footnotes, bibliographic entries, etc).

Bubble count on mobile list view like jquery mobile

Currently, if a page's font size is just a little bit larger (for example 14px), some widgets do not display correctly. Sometimes the images alignment is wrong, sometimes borders do not fit. As an example, look at...

http://www.kendoui.com/forums/ui/general-discussions/widget-display-with-changed-font-size.aspx

With frameworks like Bootstrap it is quite common that the font size is not too small. So currently it means work to use Kendo and Bootstrap together,

I suggest you either improve the widgets' rendering so they do not rely on a certain font size. Or another solution would be if each customer could create a specific CSS from the LESS by setting some variables.

provide option to make search input in listview fixed on top while user is scrolling.

Add support for the HTML 5 data-* so we can access the Kendo API in this elegant and unobtrusive way.

Example, Kendo's date picker could be called this way something like this:

<input type="text" class="myClass" data-kendo-date="true" data-format="dd/MM/yyy" data-min-date="13/12/2013" />

Currently complex elements (Like the Grid and the Chart) have so many properties and methods that the page has so many DOM elements it takes forever to load.

It would be awesome if you added masking to input fields, similar to what you've done with validation. Many times I need to add formatting to the display of a field that and I don't want to store the extra characters associated with the on screen formatting. Formatting for telephone numbers, email addresses, currency are the ones immediately useful. Although other libraries exist for these, it would be nice to consolidate them into a single library!

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

I had a combo and grid on page.
Combo has two values: value 1 with 372 items and value 2 with 21 items.
grid has paging enabled with pagesize 20 and serveroperation false.

Now when i select value 1 in combo then all 372 items are displayed in grid and then i go to 6th page of grids paging at this time in grids paging it is shown "101 - 120 items of 372 items"and then if i select value 2 in combo then no items are displayed in grid but paging shows "101 - 21 of 21 items" because it is yet on page 6 but this time there is no page 6 and in controller the request shows page 1. This is a bug.

Regards,

It would be very beneficial to have the ability to set our own labels on our chart types. This way instead of having labels set a set amount for example 10s, for 1 to 100, labels could be set at just the intervals that make sense for our chart. Like 1,15,63,100. Since ranges can already be set at a variable amount it would be helpful to label those at the point they change.

Allow charts to define multiple chart areas.  

This would be particularly useful in scenarios where historical data for an industrial process must be visualized in line charts (e.g. temperatures, pressures, valve positions, flow rates etc.)

Split buttons would allow to have a menu item that target a specific page and at the same time have sub items. It is possible to do it with the current version however it only works with mouse devices, the split button would provide the same functionality for touch devices.

It would be cool if it were at least easier to put a kendo style modal within a kendo window that covers the content of the window. 
An example: Confirmation of action, if a user clicks to close the window it would be nice if a modal could be displayed, covering only the window content until the user confirms or cancels.

Please add a click event to the Chart Legend similar to the seriesClick event that currently exists.