You can render the uids from the dataSource in hidden input fields using the treeview templates. You can then get the hidden input value and query the dataSource by uid.
We are currently working on tight integration between the dataSource and the treeview, which will be available with the Q2 beta that is due on June 21st. We encourage you to try it, and see if it satisfies your scenario.
All the best,
the Telerik team
Join us on our journey to create the world's most complete HTML 5 UI Framework - download Kendo UI