The only problem with doing the M/S thing though I've found is that you can also seriously mess with the phase of the audio in that track, which can lead to hair pulling later down the road!
Best bet, just say NO to stereo tracks unless there's a good reason for it (like was said before, a stereo keybaord patch).
Now back to this prog project I'm working on that's ALL stereo tracks and no hope at getting anything different at this point in the game, grrrr hehe
Mark