I don't understand why you're calling a raise with QTo. Even in the BB against the maniac PFR, you still are also against the two limpers. Heads-up, I would call this easily against the maniac.

I'll just imagine your hand really was QTs. [img]/images/graemlins/tongue.gif[/img]

On the flop this is the perfect situation to check-raise the maniac and isolate him. He seems to only be a pre-flop raising maniac since he slowed down on the turn and river when you showed strength, so if he 3-bets this flop, I would go straight to check-call mode. Absent that read and only knowing he's a maniac pre-flop, I'd err on the side of caution and go to c/c mode.

I don't like the turn C/R with another caller in there. Your hand isn't that strong. I'd lead the turn.

I like your river play. I think C/C is the right line here.