I could totally see this working, because in the lore their are even force users who dedicate their life to neutrality in the force, and follow a person or path rather than the light side or dark side of the force, and whether they were good or bad or called upon the light side or the dark side of the force, they still represented a neutral faction. An example would be the imp knights from legacies (not the same empire faction as in TOR) they used white crystals to display their neutrality between the two sides, and were not harbinger's of the dark side, or enforcer's of the light, but simply force sensitive soldiers who were trained to command the force properly, and could be just as strong as any light or dark sided force user. The non force using classes have already been pointed out, and a bounty hunter with a different name, and a smuggler with a different name would be easy enough to conceive. (ex. Pirates,). would it be cool? yes. Would I want it however? not exactly. I feel it would be too many resources for the developers, and how would we reason them into the flashpoints, and operations, since there isn't much reason for the cartel to take interest in many of the things in the flashpoints and operations.