Brain Damage

[Glamurio]

There is almost no reason not to hit someone in the head though

Two birds with one stone, let's refactor limb damage. Broken legs slow you down, broken arms make you unable to hold stuff for very long without dropping it. And you take damage when you punch someone with a broken arm. As for the chest... maybe more overall damage without any side effects. Safe for adding a hit chance a lá V.A.T.S that's the extend of what I can imagine.