I agree that crossover change per input would be a nice-to-have feature that would be rarely used so I would consider its inclusion optional. I think that the Large/Small speaker designation invites confusion. Rather, I would change that field to read "Use Sub Crossover?", which could only be set to "yes" or "no" manually or via Audyssey. If yes, another field sets the frequency. If no, the frequency field would be greyed out (locked from user access). Complex or no, I do think that speaker & sub level control per input needs to be available for users. In my experience, differing media content tends to benefit from level tweaking from the global setting achieved during initial setup.