1. i've never set up a team with a loot barb...
2. i presuppose u're using Kolbot
It should work like this ...maybe

- set Config.Leader = "Mainchar/Killingchar"
- set f.e. Scripts.DiabloHelper = true
- set
all Config.AttackSkill[xx] = 0 <-- he won't kill anything
- set Config.FindItem = true <-------------- THAT's what u looking for
just test it on a lower difficulty first. good luck