It would be a very usefull tool, to be able to add a "Local View Template" to a Plan Region. Very often you need that.
I know its possible to hide things, but when working with large project, where you split up same level over several sheets, its a pain in.... to use hide, because you constant have to check all your view when adding a thing in your model, and hide things that belong in same level but on an other sheet.
-Hanne