I would like to the see a feature wherein I can set additional target lines for a bullet chart. This is helpful in scenarios where I need to indicate a target and benchmark. I was able to see similar questions in your forum http://www.telerik.com/forums/set-target-range and also one on stack overflow http://stackoverflow.com/questions/25303748/kendo-bullet-chart-with-two-target-lines 

Currently I am using v2014.1.416.
I am binding mouseup event with below code.
$('#' + mainId + ' div.k-splitbar').live('mouseup', function(e){
            setTimeout(function () {
                if ((typeof ($fujicracommon) != "undefined") && ($fujicracommon != null)) {
                    $fujicracommon.handleVesselResize();
                }
            }, 200);
        });

Make the Kendo UI Dojo embeddable via an iframe. Exactly what jsfiddle.net offers. 

http://doc.jsfiddle.net/use/embedding.html

Right now on a mobile device it will put just what it needs into the overflow box. I would like to see the ability to force everything into the overflow when it is activated at all.

It looks like this was rejected over a year ago, but now that this feature is appearing in other frameworks it would be nice to reconsider.

Each tab having its own history is core to making things work like it would in a native app. It is just so sloppy when a user loses their state going between tabs.

You are able to do this with the ionic tabtrip http://ionicframework.com/docs/api/directive/ionTab/ so i would hope kendo can too.

I am seeing this bug for more than year ago, it would be really nice if you fix this issue, because it works really very well in Ignite UI, here is the jsfiddle.

http://jsfiddle.net/KendoDev/5Sssk/

Support row templates in conjunction with frozen / locked columns

Right now, the only charsets that are supported are UTF8 and ISO/IEC 8859-1.  

Since I have a lot of data to encode, I can get a more efficient output by directly writing a stream of bytes.

Modalviews have to be defined on the page at startup. It would be helpful if a modalview (and a view) could be returned or replaced as a MVC partial view, i.e. make it possible to create and open a modalview after the page has loaded. 
See also: http://www.telerik.com/forums/dynamically-create-a-modalview#1f2q7wMEu02yYX1_6El2hg

It would be great if there was a kendoUI atmosphere package library for Meteor js

When changing visibility of tabs within tabstrip, active tab may become invisible and tabstrip moves to a state when no tab is selected. I think it should be optional to set that I want it to go to the first tab available.

when the mobile view uses a header, containing a toolbar as header it would be nice to be able to have a view title like in the navbar.

Box Plot (Box and Whisker) works great but would like to have Vertical instead of horizontal.

In columns array if you set field attr with a number you'll get an error

If there has two or more gantt chart on the screen. some of the value should be able to move by dragging from one to another rather than defining again.

ListView selectable feature could be done better. One thing has been bothering me. Here's an example: http://demos.telerik.com/kendo-ui/listview/selection Go to the last page and try to select outside of list items. Problem is that it isn't possible. Maybe Telerik has thought that user also has to be able to select text normally. But for instance in Windows Explorer you can begin selection anywhere inside the window and I think the user expects that behavior.

Extend "filterable" to match the datasource's "filter" (singular, not "filters") configuration option.

I'd love it if you would consider making a real office document editor for the web. Take a look at this editor from OnlyOffice which they use in their CRM system:

https://personal.teamlab.com

It's built on HTML5 and the canvas element. The way you get complete control of every pixel and can make a desktop-like editor is simply stunning! This must surely be something Telerik also considers? There simply is no comparison to a normal HTML 4 editor which fails at such basic features as header/footer.

Columns that do not have a width setting become invisible when one or more columns are frozen.  Our grids have widths for all columns except one column which expands the amount necessary to fill all space in a grid when grid is set to 100% width of the page.  Once frozen columns are turned on, the main column then disappears until a width is added, then there is unused column space in the grid.