It would be great if in the video configuration we had the ability to have our instrument panels viewed on a secondary monitor. With LCD monitors being so reasonably priced I think I am not alone on adding this feature. This will also add to the immersion factor of the game by making it easier to control our virtual aircrafts by having large legible analog dials. Besides the fact that it would look totally cool.
I have no idea how much leg work it would take HTC to implement this. I do however know that is possible. There are other programs out there that have this implemented already like MS flight simulator, and DCSA10.