Hehe! I dont think you can do that.
Only for the XBox version; there's a glitch that can make all your NPCs Jedi.
Have you tried having a party that consists of Bastila and Juhani? Talk about Jedi mayhem!! I blink and everything is dead (Except dark Jedi, those guys are pretty tough)
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I always went with Bastila and Carth (okay, almost always) in my first time. But I've just stomped on everything that moves (and is hostile) on Kashyyyk with me (Jedi Guardian), Juhani and Bastila/Jolee. Talk about powergaming fun. Even Dark Jedi go down pretty easily if you have the first move and/or buff, plus using Force Suppression/Breach.