stored on the wall instead of the ceiling.
Now that is a very interesting idea. except i'd use at least 6 of the pole holders. 4 would line up to hold it flat against the wall when you aren't working on it. the other 2 would line up perpendicular to the bottom set so you could just release it from the top set, pull it out and put it into the extra set, thus making a "table" for working. or place the extra holders so you could work from both sides if you needed to. use screws to hold it in place during each stage of rolling/unrolling.
the poles come 16' uncut, so your room couldn't be any wider than that. and to preserve your sanity, install the holders so you'd be looking out a window (or at the TV, or at anything except just a wall).
and omigosh!!! couldn't you use the same concept for a table top? who wouldn't love a table that ran the length of the room, was at exactly the right height for the user, was easily kept out of the way when not in use, and doesn't cost a gabillion dollars? (2 hollow core doors, 2 poles, 8 holders. gotta be under $150. and EZ to install.)
you are not insane. you are a genius!!!