Exactly, except with this method those numbers would be added to the EP cost of just attacking (melee and missile having different EP costs, of course). Then you could add in more for wearing plate armor - and even more if you are not tained enough.
I believe that this method would need to have at least a slight increase in Hits => EP than they do now. But that is what Body Development is for, no? Imo, that would make the skill more appropriate.