@Rripperr:
Please spell race names correctly... Minbari, Centauri, Pak'ma'ra, Streib, and Soul Hunters (though I'm not sure which of these should actually be included; the Streib and Soul Hunters seem more like minor races to me).
UP is more like Babylon 5 than the ISA, though I'm not sure if you can rename that at all.
Minor races being League races is a nice idea, but you listed Pak'ma'ra and Drazi as main races... should perhaps be one or the other.
Agreed with the side note: Shadows and Vorlons should be of (more or less) equal status in the game. They're pretty much on the same level with each other.
@hut101:
Homeworld names (the League race ones are pretty much "unofficial"):
EA - Earth
Minbari - Minbar
Narn - Narn
Centauri - Centauri Prime
Vorlon - ???
Shadow - Z'Ha'Dum
Drakh - ??? I don't think they have a true homeworld in the series, actually...
Drazi - Zagros (not entirely sure about this one)
Brakiri - Brakir
Abbai - Abba
Vree - Vreetan
Pak'ma'ra, Gaim, Grome, Hyach - same as race name
And, well, this seems like a good opportunity to shamelessly plug my map...
Link (dialup warning: it's over 3MB)
It's based on a fan-made B5 space sim game, and is thus about as far away from canon as possible. Nonetheless, at the very least, you can get star name ideas from there.