Idea for mutations changes

so one change is mutations that “evolve” over time. or more you get used to it i hate how the getting new limbs mutations do really do anything worthwhile but again that’s new arms why can’t i wield more and stuff. i would say after a period of time after getting the full mutation you get use to the new limbs and an use them. you can carry more weapons and the amount of items you can carry on them is greatly enhanced and damaged to limbs is reduced though the amount you heal is also reduced this is mostly to spread out the damage for the hit points