Quote Originally Posted by Mount Suribachi
The GAs have been broken right from the beginning. Even worse, 90% of them are conquest related anyway making the easiest way to win a GA game to go on a conquer-fest

AFAIK, no-one has ever figured out a way to mod the GAs
Yeah its a bit of a shame they can't be modded, oh well maybe if a MTW2 comes out then we will have a chance. Homelands and conquest GA can be modded and included for new factions however.