i thought the same thing, they get too much for electric screens. im actually making my screen entirely, using 1" gas pipe inside 3" pvc plumbing tube, the gas pip will extend past the tube just enough to hang hooks there, and ill just roll the pvc tube up myself.
i too have thought about motorizing it... attatch an a/c motor, a simple infrared switch could control a relay to have the motor spin up or down. have limit switches on the bars, so when they meet when its rolled up, the motor loses power. fishing string can be tied between the bars to roll down with the screen, and when the string gets taught it pulls the limit switch, shutting off power when the screen is all the way down.
its a very simple setup, but it would work well.