Well you never know till you try ... and with that I threw up a post asking.DragonForce would definitely provide one of the tracks for this, I was hoping - that way the gun is well...not a robot - it's power metal. . Awesome to know I'm not the only one who would enjoy a mod that could do this.
Depending on what the audio SDK might allow, I'm not sure what the devs might say in the 'Ask Volition' thread - they might answer the question with specifics, or direct you to the SDK for more info. Then again, they could say it's not possible to do - which wouldn't be good .