Couldn't see it in the thread, maybe I am missing it...
I would love to have the ability to delete flooring on a curved (raised and not raised) foundation. You cannot do this on the curve, as it deletes the curve. If I want to have curved fencing on the corners of my lot (or wherever) I cannot have any height to my house foundation and I have to cover the tiles with that fake grass (if I have no foundation), which is off from the "real" grass in color... That being said, even being able to have multiple height foundations would be better than nothing.