This is not possible to do 'safely' under standard GC2 as the AIs in metaverse games are based on the contents of the RaceConfig.xml file in the MetaverseData folder, which cannot be changed without getting a cheat flag. In DA though, you can simply edit your opponents at game creation and specify their colors the same as you do your own.
thnx! I only play DA so i'll gonna try that! Thanks!