MOD

At the forum there's a Modding section here http://botf2.star-trek-games.com/viewforum.php?f=20

• How To: Make A Minor Race Playable As An Empire http://botf2.star-trek-games.com/viewtopic.php?f=20&t=3702 (search entry t=3702)

(might be out of date and some facts might be changed meanwhile, but shows it was generally possible. Whether a sixth major race is compatible with network code, especially to Multi Player is unknown by me, but somehow Matress made it playable)