Oh, it was said by Higby that once your account chose a faction on a server, you could not make another toon on that account on one of the other 2 factions on that same server.

You would have to roll another faction either on another server on the account with your first toon on your starter server, or have a second F2P account tied to a 2nd Station Account in order to play 2 factions on the same server.

Don't make me have'ta Troll ya Bro!