I figured it out. It seems too easy. I just created the mask as a .png - black where masked and transparent where I want content. Send it to a quad distort, set to transparent and put in layer ten, Then any content, as long as in layers -10 thru 9, is masked AND individually controllable via their quad distort without distorting the mask. The alpha actors are not even necessary. I don't see why this was so tough to figure out. Now i can adjust the mask separately from the content. It wouldn't work earlier because the projector actor and the quad distort won't work together in layers. The quad is always on top it seems. Why is that?
Duncan7a8435-mask-seperate-from-content.png