I am sorry I'm not sure that is possible without adding it to the regular skirmish. Campaign story editing is beyond us at this time and point. I can modify stuff like system trait bonuses or fleet sizes but not the story.
Have you guys given thought to creating a moddb page?
Moddb page up. Release coming within a week.
awwwwwwwwwwww shit here we go!
@Imperator Since the game is dead, i might actually give this a go