Don't know if this was already covered, but searched for it and didn't see it.
This possibly might make it too WoW-esc, but what about branching the jobs.
Like Whm can either go to a healing style, and get bonuses to healing or a debuffing branch where they would be more rdm-esc
Or Blm could be a nuker, or a battlemage branch (maybe even drk style)
Warrior can go dps or def
etc.
And I mean they would actually have some sort of a talent tree to get bonuses towards going these routs(yes I know its very WoW sounding) Not sure if I like this idea myself, but thought it was interesting enough to post.
Your thoughts?