One of the great features Legend of Grimrock introduced to the dungeon crawler formula is the automatic pick up of shot projectiles (which are then put in the places of the inventory they were shot from).

Where my question comes from:
I'd like to make the two back characters more useful in standard combat (except for slinging spells, of course).
One thing I noticed watching players play dungeon crawlers is that they rarely use projectile weapons, probably because picking all projectiles up one by one is so cumbersome.
Thanks!