It should be possible to trim a slab with a roof and end up with a sloped cut. Once this is allowed, it should be possible to display the bottom plane in plan. Together, these would allow accurate display of modeled attic ceilings in RCP. Then you could use a label to show ceiling heights, until the level dim tool can read the bottom of an element.
SEOs are great on slabs in 3D, but they don't read in plan.
A related wish would be more intelligent roof cleanup, where you could adjust a flat ceiling roof element to the underside of a sloped roof. You would need bottom plane display there too.
