My projector does do lens shift unless I don't understand what it means, in the menu I can adjust the screen up or down by 10 inches or so.
Currently the projector is in my living room, it sits on a step stool in front of the couch, I cant ceiling mount it in this house per the wife. I end up having to move it quite a bit depending on the circumstances. The screen is a motorized screen mounted on the ceiling. The actual screen is probably 4 inches from the ceiling. I believe its a standard 8 foot ceiling. I'm hoping in the new house to have a little more height but it really depends if I mount in the living room or in a bedroom. I'm hoping for a bedroom big enough so I can have some space to myself. The projector is about 9 feet back and I sit about 12 feet back from the screen.