I know Knife Drain and Cutpurse don’t affect it, but don’t Static Charge and Unleash the Dragon work?
No only stones.
That’s stupidly inconsistent. 
Save your rerolling for another 2 weeks as the eridium event is on where we will get increased eridium and also costs for using it will apparently be lower.
i tried on my fl4k yesterday, revolter effect works too
It has something to do with the way stones apply the extra damage where it basically just tacts on a second instance of elemental melee damage, where like Static Charge tacts on an instance of shock damage.
didn’t know the revolter worked… using the stone + revolter (w/ trigger on action skill) can get ~150+ extra eridium.
Don’t worry about Joey. Leave him alone. I just kill his two mini-boss, they drop their legendaries and I just resparn at the beginning of the map, run back and kill them again. #FkJoey.