Some Warrior job ability ideas:
Instigator (War job ability)
Enhances Parrying and Shield Block rate but increases enemy Critical Hit rate. Allows a Warrior with Retaliation active to potentially retaliate after successfully Parrying or Shield Blocking an attack.
Rallying Cry (War job ability)
Reduces weapon delayEnhances Double Attack for the warrior and party members nearby (similar duration/recast/enmity generation as Warcry).
Vae Victas (War job ability)
Temporarily increases the Warrior's Skill ranking in the weapon he is currently using but lowers Parrying and Shield Block rates (cannot raise a skill above "B+" or scythe/sword rating, and has no effect on weapons already rated higher). Grants access to additional weaponskills (for example, the warrior would be able to use Sharkbite or Crossreaper for as long as Vae Victas remained active, but not Guillotine or Dancing Edge).
War Paint (War job trait)
Allows the warrior to Intimidate a monstercurrently under the effect of his Provoke abilityaffected by his Provoke ability. Only the monster affected by Provoke can be intimidated, and the ability to intimidate endswhen the enmity generated by Provoke fades30 seconds after the use of Provoke.
Edit: Here are some other ideas I had (8/29/11), figured I'd just post them here--
Blockade (War Job Trait)
Reduces enemy critical hit rate and the amount of TP an enemy accumulates when striking the Warrior while Defender is active.
Blood Haze (War job trait)
Adds a Regen effect to Berserk. The effect grows stronger at yellow, orange and red HP respectively.
Brace (War job ability)
Dramatically reduces the amount of damage taken by the next attack, but prevents TP accumulation while active (short duration, 15-30 seconds or until the next attack lands, 3 or 5 minute recast).
Wardance (or alternately, Skirmish, I can't decide which name I like better) (War job ability)
Enhances Enmity generation rate with each successive hit that deals damage to an enemy, but increases Weapon Delay. Critical Hits have a chance to stun the target while Wardance is active. (Note: enmity generation would raise to a reasonable maximum cap, and Retaliations count toward the enmity increase like normal hits).