Maybe there could be a sort of mentor thing for them... If they don't know how to RP then the "mentor" is supposed to tell them how... The mentor has to reply to there first (enter number here) posts and the mentor needs to watch the way they RP... So they don't need to have a test, but they can be supervised to make sure they aren't trying to kill other people or messing up stories or just generally f#%&ing stuff up.