Something I want but would be a horrible idea:
Merchant Class. Your entire combat job is being a merchant. Throw gil at your enemies. Maybe have a short sword for defense. Moves and even "pets" using your retainers. IE- you could have up to two retainers with you who participate as part of your moves and act as combat pets.
The balancing would be horrible, it could never work, retainer classes would need to change, etc. But I do want it...