Roofing idea that I don't know how to name [with examples pictures]

This would be awesome!
I've also been annoyed when I wanted to create something similar to this with an attic-type bedroom but the walls of the roof doesn't register as a room and it's a mess. This type of tool would be very useful and open up many new building styles.

Maybe it could be done with a special sub-category in the roof tool where segments of a roof can be placed on a wall (almost like placing a window on a wall) that then acts accordingly for the aesthetic.