I doubt that there is an easy answer for this but I do understand the ideal. It would be nice to have other sources switched through VMC to truly behave as a head unit seing as though the buttons on the Microsoft remote dictates or let's say assumes that all you have is Media Center, a display (maybe a TV), and (or maybe not) an Amplifier. If the remote had a button to program the input button on your TV than perhaps it might "feel" that your in the same ecosystem. Add one more button to change surround mode on my amp and one more to power it on and off and life would be good (for me). This would be a more viable and obvious solution. The remotes available don't strike my fancy but the Ricavision remote comes very close except you can't get one and their website is down so I'm not certain if it will ever be obtainable. I realise this is thread is a little stale but I just wanted to say that three more buttons would have helped a long time ago.
I forgot one - Four buttons, one more to change the input on the amp.
I would like to see an updated Microsoft Remote.