As I reported about this in the past, go to Radio Shack, and buy two of their video switch boxes. They provide push-button switching input for for four video sources (composit video and L/R audio.
These inputs are straight-through (no electronics to degrade). So, each box provides an input of video and L/R audio....that's three channel of pass through. 3 channels x 2 boxes = 6 channels (5.1).They are small boxes that can sit on top of the 950. The only "inconvienience" is you have to get up and switch two boxes at the processor (no remote control). With four inputs you can have a universal player, a BD player, HD-DVD player, and a legacy Quadraphonic input!
The Radio shack boxes are, if I remember, under $50 total.
Someone does make an 5.1, remote control channel box, but it's several hundred dollars.