I'm considering using a grafik eye mounted on the back wall of my HT room, parallel to front wall. Assuming line of sight is maintained, will an IR beam, reflected off a white, 1.3 gain front projection screen, reach and operate the grafik eye? Any evidence or anecdotes either way?

I bounce my IR remote off of my projection screen to reach the front of the projector, since I otherwise can't reach the front of the projector when seated behind it. Works every time.

You might have to mount your Grafik Eye fairly high to maintain line-of-sight.

That, or get a Next Generation Remote Control Extender.