Exterior joints already dont dm.
You can only dm pecs neck abs lumbar chest.
You also cant score damage by hitting legs or arms.
So arms can be used to block already :o

Or atleast thats how it should be if i didnt break it.

I chose to make it nograb, because i want to use arms as little as possible for it to almost forve people into kicking

Putting biceps and thighs out of the equation could be a thang.