I'm lazy - I let the 990 apply PLIIx for any TV source. If we stumble across something that is essentially pure mono, then PLIIx can only do so much and a lot of it goes to the center. I do have the center width set up around 4 or 5 so some of the center data gets distributed all the way across the front.

You're not going to get any surround effects, but that's going to be true for anything short of something like 5/7 Stereo.