I've seen training dummies used to practice rotations. Early Class Quests and Guildheists exist (as far as I can tell) for further training. What if you take the instancing of a guildheist for 1 player, mix in some Street Fighter IV training simulator and achievements? Possible scenarios:

• A list of job based rotations are provided with increasing complexity. This is similar to the standard leveling process but allows for focused mastery. No exp gained. Score/Achievement based on successful execution in the shortest time possible.

• You create your own custom rotation you'd like to execute and are scored according to optimal timing/input.

• You have a limited amount of time to pump out the most damage/healing however you see fit.

• How many casts can you silence/stun/interrupt in a row?

• On higher difficulties, add AOEs (your choice or random).