It's not an original idea, but I'd want one of the 10-team divisions to be the original Big Ten with each division performing a round robin. So, excluding OOCs, the only interdivisional game would be the BTCG.
I know it won't work. It's just what I want. Obviously, challenge one is to get enough additions. Even then, how do you reconcile the central teams being together while UNL and others out west pair with PSU, Maryland and others out east?