I have a bunch of house rules for my game. I use Critical hits and fumbles, secondary skills, mass combat rules, and a bunch of other crap to make my game more enjoyable for myself and my players. Any GM worth his salt will develop their own set of house rules to enhance their campaign. Some of the stuff I have is hand-written or done on an Apple IIe, so long ago that I have no desire to transfer it to word format. Yes, I've been doing this for some time!
Mass Combat System Advanced Combat Maneuvers Perception Roll Stat