Bill
My system is a mix at the moment. Mostly 2 channel, but still go to Home Theater from time to time especially for a few choice DVD concerts. My B&K drives my other external speakers via the Pioneer Elite SSP..Side surrounds, Center Channel and my other external speakers throughout house and outdoors via a speaker selector too...Currently got a Coda Integrated that runs my Front L & R speakers for the necessary power and drive plus its able to be bypassed for HT use.
You can Bi-amp but I don't think you will want to when you realize the ability of the B&K to drive your L&R 804 B&Ws plus your center and even your rear channels. You can bi-wire, but I would not suggest it, put your jumpsers in for the speaker terminals and run single wires to and fro....