As suggested here : http://www.telerik.com/forums/supporting-both-comma-and-dot-for-decimal-input
With this example : http://trykendoui.telerik.com/ikId/2

Having to force either the dot or comma for numerical input is cumbersome in applications where customers input data all day long and it has to be effective. 

I would suggest a flag named along the lines of "IgnoreCultureOnInput" which would allow you to punch in either the dot or the comma, but have it converted it back into your local for display. 

Note that the example above is not complete as it is : 
1 - locale specific (won't adjust if you locale calls for a comma instead)
2 - does not support text selection