Please consider adding animation to the slider control in a similar way to the linear gauge or the ajax slider control.  this would add an extra dimension to the controls capability

When I hit Update wizard, there were pending changed in TFS so the Wizard made me confirm the update failed 849 times

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1. Dynamic content issue: Click on a tab with AJAX content, and it loads slow, while it's loading click other tab with AJAX content. You will get 2 opened tabs with loaded content as 2 divs one under another.
2. When you put your tabStrip on very end of your html document and when you want to change its tab at 1st tabStrip toggles active one (that's why html doc shrinks) and shows new one. It's content is below and you have to scroll whole page to see it. You can investigate it even in your demos pages.

HTML input of type file has a "false" default value for multiple whereas KendoUI has it set to true. In addition, KendoUI ignores multiple attribute in input definition while it uses it for the emitted HTML.

Replace de default browser scrolle bar in container widgets like splitter or panel bar

Please give some good Red color out of the box theme. Currently there is no good theme. All are ble/black/gray.

Add a dropdown text value that can be turned on or off, like "Anytime" or "None Selected".  Or even better allow the programmer to change this value.  One example where it is needed:  In an Air Search on a travel site, there is a time value that can be sent to the reservation systems for finding flights.  It is not mandatory, but it does change the results provided if time is included.  In the current implementation, there is no way for a user to not choose a value.

I've been using nRoute framework on silverlight, and some MVVM features that it provides, really is a miss on kendoo ui. 

for example some of the "killer features":
1. On a view, you can apply url like template attribute ("Content/Views/functionality/Loadstuff/{AccountId}") and the internal routing will find that and initiate, when it is called via global static navigate method.
2. The binding of View and ViewModel is done very well. On the view model, you apply attribute that this viewmodel is working with this view.
3. Containers. You can call navigate url, and get the rendered viewmodel. This helps application composition as you can have a some layout templates, and apply custom attribute on div, like "container-url" to some internal url, and it will fetch the rendered view and put it there.
4. Communication framework. Literally a Pub/Sub.
5. Modules/Dependency tracking. For example, i have SPA application, that loads some basic controls for js, and when user clicks reporting, it will check that reporting is dependent on Dataviz, loads dataviz, and loads viewmodel.
6. Behaviors, very common things, like, ValueNotNull, ValueNull, BooleanValue for someexpression. This allow you to create more dynamic ui, without adding new code in your viewmodel

Suggested fix

                if (a != null && b !== null) {
                    return a > b ? 1 : (a < b ? -1 : 0);
                }

                if (a == null && b == null) {
                    return 0;
                }

                if (b == null) {
                    return 1;
                }

                return -1;

Improve the xml parser so it can handle missing data that is sent in a shortcut manner.  For example, NAME is blank or missing:

<NAME></NAME>

Shortcut manner is

<NAME/>

It’s a web application without server side, which use google javascript Client API to provide additional tools for google calendars management like :
- batch deletion
- generation of recurrent sequence of events.

I want to ask you to add support for this type of call to kendo.format:
    kendo.format('{0} - {1}', [3, 5]);
Of course this is not useful if you have the parameters in seperate variables.
But it is useful if you get the format and the parameters from some external source and that delivers the parameters as an array.

It will be good to make Switch for check box, and some radio button type control available for Web just like you have for Mobile.

We can do it using JQuery getJson or .ajax calls but would be good if everything gets unified inside Datasource so all on-screen controls can be bound to a datasource not a specific control.

Its very important to have dynamic binding in the Tree view. Many users are changing the control from Kendo and using other controls because of this. Many large organisations have this problem and both of user and developer is loosing the opportunity to use it.

Allow to customize and define what html attributes to be rendered as part of the LI elements of the navigation widgets.

A direct and simple way to build a tree from an Object : 
Work fine like that but a shorter way would be better
a.k.a ~ $("#mytree").kendoTreeView({'ObjectSource':myObject)
try this html to have a better idea of what i suggest.
Thanks


<body>
<ul id="mytree"/>
<script>

         $(document).ready(function() {

         		 var myObject = {  "who"    : [ "french", "man", "old geek", { "age": "49", "status" : "with a wonderful wife" } ],
                                       "living" : { "Europe" : { "France" : { "cities" : ["Paris","Bretagne"]}}},
                                       "loving" : [{ "langages": ["KendoUI", "Node.js"]}, { "other" : "chocolate" }]
                                    };


                 var ObjToHtmlUlLi  = function (obj) {
                                            var result = "";
                                            if (obj instanceof Array) 
                                                for (i in obj)
                                                    result += "<li>" + ObjToHtmlUlLi(obj[i]) + "</li>";
                                            else  if (obj instanceof Object)
                                                        for(i in obj)
                                                              result += "<li>" + i + "<ul>"+ObjToHtmlUlLi(obj[i])+"</ul></li>";
                                            else
                                                result += "<li>"+ obj + "</li>";
                                            return result;
                                           };

                $("#mytree").html(ObjToHtmlUlLi(myObject));
             	$("#mytree").kendoTreeView();
                //=> somethins like   $("#mytree").kendoTreeView({'jsonSource':myJsonObject) would be great
        });
</script>
</body>

http://www.kendoui.com/forums/ui/general-discussions/touch-counterpart-to-mouse-hover-touchhold.aspx

When many columns still visible in the grid, but not in the columnMenu, the last columnMenu entry is disabled rather than checking it is the last grid column. 
The method to avoid this is to wait using a timeout() and re-enable all checkboxes in the DOM after the click event, which is not sensitive to which grid the event is occurring as the columnMenu is outside the grid element.

I'd like to be able to catch more points during the databinding and rendering portions of a widget to allow for customization, such as modifying a row on a datagrid, or a render event that could kick off other work. 

The alternative could be a way to inherit from existing controls and the ability to stub in methods as needed.