I can think of a couple of additional features:

1) A volume control that actually works. I hope I don't need to explain this.

2) Preamp Outputs and Amp Inputs. This would allow the replacement product to be configurable by the user. Additional amps could be added to drive a particularly inefficient set of mains or bi-amp a speaker. Even run a separate zone.

3) Support for dual assignments of analog and digitial audio inputs to the same device with fast accurate automatic selection (this is a step up from the 950).