How about Gambit system?

[Grit]

Gambit system? wassat?

Another new feature in Final Fantasy XII is the "gambit" system, which allows the player to program each character to perform certain commands in battle in response to specified conditions.[12] Using gambits, the player may set reactions to different stimuli for each character. Each gambit consists of three parts: a target, an action, and a priority. The target specifies which ally or foe to act on and the condition for applying the action. For example, the target "Ally: HP < 70%" causes the character to target any ally whose hit points have fallen below 70%. The action is the command to be performed on the target. The priority determines which gambit to perform when multiple gambits are triggered. These heuristics guide the characters when acting autonomously, although player-directed commands are always given top priority.

In a nutshell you decide how a character responds to each situation, and let the AI take over. Again, this makes no sense to implement into a normal MMO battle system.. unless you're controlling pets or NPCs.