Most Force powers described on Wookieepedia are allowed, though some more powerful ones (Force Storm, anything involving bending space or time) are regulated...by other members. Not by staff. We don't really care what you use unless a member reports it for being unfair or overpowered. In general, though, you should never try to go above your station. Apprentices should be using basic/simple/root/rudimentary powers, while Knights can get more advanced. As long as you put the effort into learning and mastering it, though, and you don't go overboard trying to use it, you'd be surprised what you can get away with.
So quote Sarge before he has a chance to say it, "The Force is infinite. Your ability to use it is not."
That said, there are a ton of Dathomiri magics available for use. We're not exclusively running on Clone Wars canon, so things like Force imbued weapons, blood trails, and the like are all available for those who learn how to use them.