Thursday
It would be good to create a separate object called ceiling and add various functions related to
ceilings, such as putting molding on the ceiling and making a well ceiling.
Friday - last edited Friday
You might need to research a little more before making wishes.
Mouldings (cornices) can be added with a slab accessory or by magic wanding a custom profile beam to the slab.
Well (coffered?) ceilings can be made by cutting a hole in the slab, placing a slightly higher slab in the hole and adding walls or beams around the hole.
I am not sure a dedicated ceiling tool is needed to do this (just my opinion of course).
Barry.