It would be great if roofs could have components like walls. That would also go for dormers. I am working on a home with 4" rigid insulation on exterior. Putting in a roof thickness and hoping that the bearing height is correctly calculated is dicey at best. It would also be great to be able to spec walls and roof of dormers. It would also be great in dormer windows could show up on floor plans without the roof layer visible.
Cheers!