Kendo UI mobile widgets are really falling behind and now need an urgent refresh. Most mobile widgets have not been updated in 3 to 4 years (https://github.com/telerik/kendo-ui-core/tree/master/src).

The most urgent is for styles to be updated to match LESS and SASS styles. Currently, styles are a mess and making a mobile app including the grid and other recent responsive widgets with consistent styles takes a lot more time than it should:

- NOVA has many specificities not available in other themes

- OS skins have no match to style the grid and other web responsive widgets

- Material UI is not consistent and up-to-date

Kendo UI supports PDF export. It would be great if you could add glyph mirroring support to it as well (https://github.com/mozilla/pdf.js/blob/master/src/core/bidi.js). PDF export of RTL languages such as Arabic and Persian need this trick to work properly.

It would be very useful from a visual and functional perspective to be able to view scheduler items in a year view, that seems to be currently unsupported.

Some kind of animation for the splitters when you collapse/expand them?
Even nowadays there are people not used to the web environment, and if the collapsible pane just hides instantly (or almost) they will first think 'Where did my *whatever* went!?' so having some kind of easing they would see where did it go.

The new funnel in the Q3 release is great, but it looks very flat.
It would be great to have a more 3D look.

It would be really nice to have an easy way to dynamically create Kendo Windows in AngularJS. And also with separate controller and template.

https://github.com/kjartanvalur/angular-kendo-window

Here i´m trying to do this but it would be really good to have a similar way integrated into Kendo. There is also a demo on the repo.

http://plnkr.co/edit/6lyrblMhZ5ofuonmGoPZ?p=preview

Check out this idea. It may help solve this issue and help with UI presentation.
http://feedback.kendoui.com/forums/127393-kendo-ui-feedback/suggestions/3767009-treeview-in-combobox

Admin edit: A Knowledge Base article that shows how you can achieve this: https://docs.telerik.com/kendo-ui/knowledge-base/disable-multiselect-items

A heatmap (grid-style at least) is very much useful in any decent project management application. A widget that could remotely connect color-shades to jSON data would be really great.

It would be a great help if there was a way to add a Trendline to a line chart in the DataViz collection.  This function is available in excel and other similar programs.  
The wiki page explains:
http://en.wikipedia.org/wiki/Trend_line_%28technical_analysis%29

Globalized applications use the DateTimeOffset type instead of DateTime since it includes the offset from UTC for different time zones. If DateTimePicker could bind to this type it would simplify UI development. It would have to have the offset or timezone value provided as either a property or as a second binding.

Personally, I much prefer image buttons over text buttons in the grid just to keep bulk down especially when you have a wide grid or a number of custom command buttons with long text.

To do this at present requires some fancy css styling in the grid databound event.

I would like to see more configuration options for grid commands to allow for ....

- Built-in commands (Edit, Delete, etc) and custom commands to be image only
- Built-in commands and custom commands to have a "tooltip" option

A recent update added the Checkbox widget that uses a novel set of CSS and HTML elements to stylize the checkbox in the browser.  This style is not automatically applied to the TreeView widget's checkboxes.

It would be very nice to have the TreeView checkboxes stylized to maintain a consistent look and feel across widgets:

http://docs.telerik.com/kendo-ui/web/appearance-styling#checkboxes-and-radio-buttons

Your silverlight Timebar is Briliant.

I suggest you implement something like that(maybe a litle less complex) in KendoUI.

There should be the ability to show resources (this is multiple resources) without grouping. All resources will show in a line. This would have worked in our case where we have employees and sub-contractors as two different set of resources but cannot be grouped. We needed to show both the sets on the scheduler at the same time and also assign events across to both sets (so an event can belong to an employee and sub-contractor). The two sets cannot be combined into one resources collection as the resources can have the same Ids

Please think the Kendo UI validation farmework not only in terms of client-side validation but also in terms of reporting server-side errors.

A framework that would only provide a way to display a validation error message based on a client-side rule after each related input field would not be very helpful in my opinion.

All errors need to be reported in a consistent way. My preferred option is:
- a message box at the top of a form to display all messages including OK messages and error messages (client-side and server-side).
- higlighted fields with tooltips (not to clutter the form layout) to repeat error messages in context when applicable.

Although the framework built into Kendo UI might only provide client-side validation, please make sure to provide entry points into the UI used to report errors. Alternatively, leave the UI to the developer and provide a simple way to collect all validation error messages on a form.

Allow creation of custom labels that can be placed any where on the chart surface using x, y coordinates.

Please allow us to set tooltip offsets, so I whatever value you calculate it to be shown at I can "push" it off further.

Also please append a class showing of the location of the tooltip (top, bottom, left, right) to help us style appropriatly.

SNS and e-business always use this for make a comment.

I have a list view of unassigned users, I can drag and drop from listview into a treeview to assign them to a group node in the treeview. (This works) I need to drag multiple items to the same group node to add more than one person at a time.

multiple draggables to one dropTarget.