Since they once said they wanted the game to be more tactical, and to make positioning more important.....
How about Battle Formations. As you and your allies position yourselves around your enemy, you gain extra bonuses (or the enemy gets some negatives) for as long as you hold the positions.
O = enemy
X = player character
So like: "Strong Defense"
X X O
The player farthest from the enemy would gain a slight attack bonus, 10% of that players hate generated while in this formation would instead be applied to the player in front of him. The player in between the enemy and his ally would gain a slight defense boost and maybe a boost to block rate.
Or: "Beat Down"
X O X
Both players gain a slight store TP boost, while the enemy gains defense down.
You would also be able to stack them as long as all the requirements are met, so both at once would look like this:
X X O X
However, only the players in the actual individual formation would receive the benefits, so only the player between the enemy and another player would receive the benefits of both formations while the other two would only receive the benefits from the formation they're partaking in. They would still benefit from the negative status's on the enemy such as defense down.
You could also have more complex formations using up to 8 players, maybe even multiple enemies.
Formations would be automatic and would be applied to the first people in that formation so for instance if a player moves in between two players in the "Strong Defense" formation, he would not receive any buff and the formation of the others would remain undisturbed, unless one of the two move out of formation, then the formation would be reapplied to the new participants.
This wouldn't stop two others from creating the same formation else where around the enemy.
Some formations would work with the position of WS's, and some would work against. If a formation with a greater number of participants has the same set up as a formation with a lower number of participants, only the benefits of the greater one is applied.
Formations would only consider and apply for party members, in active mode (maybe, some things would have to change to include mages) and targeting the same enemy.