Currently node selection is done after MouseDown on a visual node element. We are planning to implement drag and drop of multiple nodes in RadTreeView so we will be happy to collaborate with you in order to ensure that feature is stable and usable. Could you please share with us your exact scenario?
It will be best if you can send us a sample project that demonstrates your issues with node selection. You can do so in a new support ticket.
Thank you for your cooperation.
the Telerik team