For example when I place a PaperSprite component as a root with it’s collision enabled I can’t scale it. But when I add a Scene component as a root, I already can scale it. But at that time I have another problem. Collisions stop working when I move the actor with Sweep option enable for SetWorldLocation method. (See here for more details.)
In general, why Root component does have ONLY Scale part of the Transform when it is inherited from USceneComponent?