I agree that Room EQ is something that should be applied only after you've explored positioning and room acoustics options. I also agree that correction in the frequency domain is usually better restricted to the subwoofer range - above that level the room modes are usually going to be close enough together that there won't be any huge holes.
But I think that parametric EQ on the subwoofer channel has a lot to be said for it, and I think it's a shame that you've ruled out the idea. I'm sure a future SP1.7 model would do a far better job of it than the Behringer Feedback Destroyer I'm probably going to end up using....
And once you go a generation or two farther, and start thinking about room correction in the time domain rather than just the frequency domain, things really get interesting. I've never had the chance to listen to a TACT setup, but the reports I've heard is that is absolutely stunning - really does make the sound independent of the listening room.