I like the 'kiss' mentality, I like the 3 inputs to one output suggestion, and I really like the 7.1 suggestion. So here's what I'd like to see in a product along these lines.

1) Analog only
2) 3 (or more) inputs
3) 7.1 channel inputs
4) no wacky/kooky gadgetry, let my pre/pro handle time alignments etc.