Dean, since the 3310 already has DPLIIz with its height channel provision, it's questionable how many would go for a $100 upgrade just to add a width channel.
Jay, the A and B surround feature on the Denon doesn't involve separate amp channels(and certainly not separate amps); it's simply parallel wiring to the side surround channel, with of course the identical side surround material in both. So, there's nothing that can be assigned for another purpose, since the content has to remain identical.
