Can somone make a gun that can hit only the arms or the weapon the enemy is holding? I find that disarming is a good stratagy. If somone could make this i would be grateful. Thanks in advance.

That is currently impossible, tho i think it would be possible to have a scipt run on an actor prohibiting it to fire/throw stuff.

Something like the Lua guns mod, where you have those upgrades.

Remember the homing head bullets?
Probably something like that.