Before you say anything, no I do not mean being able to hit people with them.
To my knowledge you cannot use 2 seperate stacks of arrows properly. If we were to add a secondary mode function to be able to switch between quivers though.. For example, you are cruising around with one stack of 20 barbed arrows shooting peasants, but then you see a plate armoured guy. Oh well no problem. Press 'x' and switch to your stack of 15 bodkins. I think it would greatly add variety to archery and allow for more tactical gameplay from an archers point of view.
Discuss, troll, whine, etc