If we're talking about his adaptive aim algorithm I'd like to see it ignore taunts and armor buffs. IG88 is a Droid, he's not going to be distracted by someone making a commotion. And he's going to shoot at that one spot where the armor doesn't cover.
His leader ability can be upgraded as well. Every time a Droid damages a character with a DOT on them they gain 10% TM and 5% health back.
Rapid fire needs to be upgraded to dispell all buffs before damage is dealt and also apply buff block on a crit.