My favorite enhancement I have for gaming experience is the Creative Dolby speakers I have on my system. When I lift of the base rattles the shelves windows in my apartment.
The problem, I think, with any kind of interstellar travel is that there's no real way to do it without ruining the realism in the game. I don't think I'd like having a warp engine or waiting years of game time for a probe to enter a new system.