I was thinking it would be interesting if the player character could potentially lose a limb in combat, maybe if you take significant damage to it when it's already broken, giving some lose in special and abilities when a limb is lost, like not being able to use larger weapons, sort of like the Live dismemberment mod but for the player. Then you could combine it with a prosthetic and cybernetic type system to open up some interesting possibilities. LIke if you get a leg blown of you could replace it with some wood or pegleg on the fly so you could still walk but later, like after a related quest, you could get some advanced cybernetic to make it work as well, or better than before. Maybe even add some cybernetic limb-specific abilities like an arm cannon or laser, or a separate system for regrowing or genetically modifying your limbs. Also, a sort of related question is it possible to make Skyrim style powers in Fallout, like pressing z to activate an ability? As that would make the arm canon idea more viable. I would like to make such a system myself one day but know next to nothing about modding so it would be a while if ever.