Here's a somewhat-complex idea: Can someone make an add-on that takes some pointers from Super Smash Bros?
The player would need an all new model, with actual arms, legs, and joints: But the idea is that your inventory is replaced by "Moves": Your standard attack moves that are varied by the direction you're currently moving in (IE, if you want to side-kick someone, you sidle into them and click, and if you want to use a straight punch, you'd walk forward into them and click), and your four "Special" moves: The highest one obviously being some sort of recovery move, the lowest being some sort of area move, and the projectile/huge damage moves somewhere in the middle.
TL;DR? Didn't understand a word of that? I'll summarize it.
My suggestion- Make it so damage isn't exactly DAMAGE, but instead some sort of stamina damage.
- Make a weapon that makes the player do different animations and does a different amount of stamina damage with each type.
What I think will need to be done in the mod's creation- You'll probably need a new player model with new animations for each separate attack.
- You'll probably also need some sort of GUI mod that shows your stamina damage in a gauge.