I tested your issues and here are the results:
1. I didn't manage to reproduce the problem, could you please send me a sample code or open a support ticket and attach the project there.
2. This is by design, we have decided for the Value
not to be nullable, but as other clients also inquired about such a feature we put in our to do list, and will implement it in the near future.
3. This is a bug, which we will fix right in the next release.
I have updated your Telerik points for your involvement.
the Telerik team