I am put off using KendoUI because of the limiting nature of theming and styling the controls especially the sprites

They don't scale well, can't be coloured and are hard to replace without lots of css editing. 

Right now kendo ui allows Inserting table BUT no button to delete whole table inserted, it not convenient on user experience.

Create UI for XAML. So we can develop "like Silverlight" applications using C#/XAML, UI designer and MVVM but with no javascript, ASP.NET, etc

There are thousends of C# developers that dont want to mess with javascript and HTML, it is improductive!

cshtml5.com is tryting to do this, currently in beta 7 but got of interests they have to raise beta downloads limit.

 Buy them or implement your own solution. Combination of cshtml5.com and KendoUI nice widgets and themes could be awesome and perfect replacement for silverlight and developers that dont want HTML/JS.

MS visual basic was popular because it was so easy and fast to create projects with it. We need this kind of fast web development with XAML UI editor etc.

Nowadays for a simple project you need a designer(CSS), frontend developer(HTML/JS) and backend developer (C#) at minimum.

I have never meet a single developer that likes to work and do the best in those 3 roles. Most C# developers dont like UI, CSS or JS etc.

Make better kendo framework documentation. Demos are fine but it does not have many of the necessary information.

Since 'bind' and 'unbind' have been deprecated and replaced by 'on' and 'off' in jQuery, kendo controls should support the use of 'on' and 'off' for event binding.

Provides a easy way to filter a list with a simple client-side search feature (example add data-filter="true" attribute to the list). The framework will then append a search box above the list and add the behavior to filter out list items that don't contain the current search string as the user types.

When the are building the grid, will bu useful to have and option to set the page number that you want to display
 
.DataSource(dataSource => dataSource
        .Ajax().PageSize(Model.PageSize).Page(Model.Page)
        .ServerOperation(true) // Paging, sorting, filtering and grouping will be done client-side
                        .Read(read => read.Url("/results/gethomes"))

It would be nice to have a feature available to let user import excel sheet and import its contents in existing Kendo UI grid. 

The library is getting pretty big - lots of great features, but still big.  I would love to see the team take some time and offer more options to reduce the size of the ALL and CUSTOM builds.  Perhaps look to drop old browser support and do a pass on tightening things up.  Set a goal for the team to reduce the library size by 10%.

Add custom defined formulas

It would be great if it is possible to disable certain dates in the calendar. Maybe if it is possible to pass an entire array with calendar-date-objects, it would be more convenient to disable dates or highlight certain dates.
e.g. CalendarDateObject could have 3 properties:
- CSS class (this style would be applied to that certain date)
- Disabled true/false; default = true (if disabled, date is not clickable)
- Footer text (When you hover over the date, you can see this text in the footer)

By using an array of objects, you don't have to check if a date is in a certain array to change the CSS-class of that date. In the way it is now implemented, you have to write all lines of code to check if the date is in an array.

Add Auto Fill and Fill Down functionality to Spreadsheet

Thank you for  adding Excel-like filter. This is what we wait for a long time.

Could you please add textbox to excel-like filter?
So, if there are too many options in filter i would like to search for option i need. (Kind of filtration in excel-like filter)

Example: http://imgur.com/SIdHmSb

Define by Settings or via API Calls to enable or disable 
any Cell or Cell functions like Context Menu.

Using the Sortable Widget on a Grid works great to allow the user to manually sort the grid rows.  But if the grid has a vertical scrollbar, the  user has to drop the row multiple times to get a row from the top of the grid to the bottom.  It would be nice if the grid would Autoscroll when the user gets to bottom of the viewable grid.

Thanks,
Mike

Use checkboxes besides the dynamically created items in the legend of the chart without defining a custom legend.

Please see the attached image here :
http://www.telerik.com/forums/can-i-use-checkbox-on-dashboard-tip

The hover in grid has to be on entire row/item, not only in frozen/normal side, as it is now.

Office 365 & Nova theme have default support for item hover, but this does not work properly when having frozen columns.

Why Code Library is nearly empty? While checking up results at forums, nearly I can not find what I'm looking for. To speed up this process. You may add more examples from stuff to the Code Library. Specially about extending current version of widgets, I think it will give a better understanding of the kendo api.

As there isnt a pure spreadsheet control, adding this function will allow users to still make changes in excel but visualize it in the app.

Add an option to rotate the text 90 degrees when the tabPosition is set to Left or Right.  Without this on a mobile device the control is useless as it takes up the whole screen.