Combat in skyrim is just button mashing. If you changed it to show that kind of locational damage then it would (in my opinion) be necessary to change the combat to something other than button mashing so there would be some way to choose if you mash some enemies face in or go with the upswing into the testicles of your opponent. If I were to slice of a draugr's left arm then I want to be able to do it on purpose and not as part of a button mashing sequence.
Dual Wielding in combat is nothing more than L Trigger, R Trigger, L Trigger, R Trigger,L Trigger, R Trigger,L Trigger, R Trigger,L Trigger, R Trigger,L Trigger, R Trigger,L Trigger, R Trigger,L Trigger, R Trigger,L Trigger, R Trigger,L Trigger, R Trigger,L Trigger, R Trigger,L Trigger, R Trigger,L Trigger, R Trigger,L Trigger, R Trigger,L Trigger, R Trigger,L Trigger, R Trigger,L Trigger, R Trigger,L Trigger, R Trigger.