Thanks for getting back to us on these issues. We don't get that much feedback on the plugin API so the info you provided is really valuable to us.
The EntryPoint thing is a bug and it will be fixed in the next official release. There is currently no way to change the selected item in the treeview. We'll add one in the next official release, too. Would you like to get a pre-release version with these changes? If so, please let me know what would be a convenient way to send you one.
the Telerik team