I believe that something along the lines of a T3 1hr ability could be a feasible solution to a new job specific enhancer:
WAR: Frenzied Strikes - Grants 100% double attack rate with increasing critical hit rate for each successful hit. Durration: 30 sec.
MNK: Recoil Stance - Grants 100% guard rate and redistributes damage into user's next attack. (mob normally hit for 100 dmg, blocks and takes 20 dmg, 80 dmg is distributed between all attacks in next attack round) Duration: 1 min
WHM: Soothing Prayers - Creates a regenerative aura around user granting all in range high resistance to status effects, and grants high regen/refresh effect. Duration: 1min
THF: Encumbering Assault - Grants user random status affliction (lowers evasion/defense/attack/accuracy) upon striking an enemy and increases duration affliction for each successful strike with. Duration: 1min
PLD: Divine Retribution - Absorbs enmity from party members within range and grants damage mitigation effect. Doubles all mitigated damage and inflicts it upon current target. Duration: 45 seconds
DRK: Devilish Strike - An accurate strike against targeted monster dealing critical damage based on current enmity and terrorizes foe. Duration: Instant
DRG: Lancer's Fury - Allows user to perform numerous Jump commands within the effect's duration. Duration: 15 sec
COR: Pirate's Bounty - User performs instant damage. Damage is calculated based on enmity multiplied by active roll status. Duration: Instant
PUP: Grand Performance - Automaton and master perform a coordinated attack inflicting critical damage and random status effects. Must have an activated Automaton. Duration: Instant
That's all that i could think of atm...lol