Brian,
Thanks for your message. I asked Shaun Walker about this at the OpenForce Conference because we are using Telerik on our links, menus, html editors, as well as third party modules we have purchased. I thought this was going to be addressed.
We do have the enterprise Telerik controls but it looks like just coping a DLL with the another version may fix one control but it breaks another. This could be a real issue upgrading to DNN 5.2.
Let me know when you find a solution.
Thanks for your support,
Lewis