Just throwing an idea out there, what if we had a job that's a combination of crafting/fighting class? The Machinist when off the the battlefield would repair and create things such as Magitek Armor, Automatons (for PUP), Guns (gunblades?), and the like. However, Machinists can utilize a smaller, more mobile version of the magitek armor for battling (since it's main weapon would be something such as a wrench).
The class itself wouldn't get much gear, however the magitek's strength increases with the Machinists craftsmanship/M.craft/control level (higher craftsmanship raises melee stats, and same for magic and m.craft, and control for ranged attacks)
EDIT: The machinist could perhaps create beacons/gears that provide effects, i.e. a healing beacon that while active and within range, provides a regen/refresh buff, another beacon that offers a slight protect/shell buff, another that increases physical atk/def. Of course these wouldn't be as potent as BRD/WHM buffs, but would add depth to the class, as well as desirability for parties.
Perhaps also, the Machinist could employ weak turrets, which would provide slight damage to enemies within it's range of sights. Of course, this damage would be considerably weak, but really only useful for taking out many weak enemies (such as the plumes for garuda, if there were a similar battle in 2.0 the Machinist would be a huge asset to this fight).
Thoughts?