Gonk, I know that you can assign the individual input jacks as you please, but what I meant was that there are (afaik) only so many input positions on the 'source switch'. What I wanted was to be able to expand on that.

Say the available sources are (default names) cd, dvd, video1-4, and aux. dvd is assigned to the component video input and optical audio input. I've connected my aux to a turntable via a preamp. video 1 is my vcr (analog audio and s video). video 2 is my cable box (component video and coax audio). video 3 is my laser disk player (composite video and audio). video 4 is my tv's composite video out and analog audio out). cd is connected to my mp3 player's analog audio. I've used up all the input positions. So I define a new one! The unit adds the extra position on the 'switch' I call it dvd-cd and assign the 5.1 analog inputs to it. I add another position and connect my dvd-s hdmi 1.3 outputs to the hdmi input. This is the up-converting dvd player. I then assign yet another video input and connect it to an unused s video and analog audio input to my computer.
I've added 3 'positions' to the input source switch and assigned unused connections to them.
Can I do THAT today?