So this just popped into my head during class, and I thought I'd jot this down. I was thinking (again) of Star Wars SAGA, although this can be adapted to any RPG. It's a modification to the initiative system.
Basically, whenever you roll for damage and exceed the target's damage threshold, apply your margin of excess as a bonus to your next initiative roll. Initiative would be rolled at the beginning of every round. The idea is to give combat the feel of "shock and awe" that's typical of a fight with big explosives. Once a side gets the upper hand they usually keep it. There needs to be a counter-system, like the other side using a Force Point to negate the bonus the other side gets. Dunno.