Personally, since someone said machinist and commented on "Called Shots." I would rather see a Job added to Archer that is a Debuff Class. Something like Arcane Archer that has damage over time abilities as well as some abilities to "Slow," "Weaken," or even "Freeze" enemies. As to how it fits in the game? Well Archer already has a few abilities that goes with the ideas like "Blunt Arrow," "Venomous Bite," and "Windbite" and adding in a little Thaumaturge + Archer quests to give a background in combining the Classes seems to stay in character of the world so far.