At this point, going to mono is probably not going to happen..maybe add mono out in the middle to make it LCR..but the car..i mean the subs are in the way. lol.
Again you are missing the point. With an LCR- EACH of the elements HAS to cover the entire room.
What speaker system would you put in the middle (center) that would cover the whole room? Especially down front left and right?
While the "concept" sounds good-the actual implementation is not always so easy.
Unless of course you don't mind some people not hearing well.
So some people can't hear the center-others can't hear the left and others can't hear the right.
So you are just adding MORE seats that can't hear everything.
Kinda sounds like a step backwards to me.
And don't let anybody tell you that you can put a center hang in front of the subs.
How are you possibly going to align it? If you think you can just delay the mains-think again.
Consider this: With a flown cluster-the sound from the speakers that reaches the audience is already "late" reaching the audience-as compared to an acoustic source on stage. This is partially due to the path length from the speakers to the audience-plus any delay in the console (if digital), the DSP etc.
So adding more delay (and it would be more than just the physical distance between the subs and mains, due to processing/crossover filters etc-just makes the sound from the mains even later.
Just sayin' you need to consider more than the "simple" ideas.