They can't largely because I don't overly want to flood the world with crystals in a way we can't really control. Instead, I am thinking we should have more garrisons with crystals.
Crystals should, I think, be a way for an admin to reward difficult/competitive era, while AIs just make any era more fun (I hope ).
If there's a strong desire i'll definitely reconsider though!
Colonies that place on the world for you to conquer, that are not in fact players.