Sorry bud. It was built ground-up for the console, and therefore the 360 remote. You didn't HONESTLY think that you were the first to think of this, did you?
What most people complain about here, erroneously, is that a port to PC would dilute the gameplay, because you would have to tweak it to make it work with a mouse and keyboard.
Lethe:
Then you should be pretty happy with the game; it's a lot of fun.
Even if a squad of marines out of dozens of units on a battle field has shoulder pads .25" too thick for a fanboy's tastes :)
Inspires confidence, no?