OR just remove them completely. I feel like a CV shouldn't be able to wall in another CV just by coming up to it, it feels rather cheap to get the comm walled in and destroyed without any hope for recovery in 30 seconds.
They would spawn a third CV that would wall them both, then sudden death would occur. Have you learnt nothing?!!111
There are a lot of times when people suggest stuff like this and I go against it, because it's really detracting from the point of Empires in general, diluting the game. This isn't one of those occasions. It's pretty fun, it's won me games, but I know this is something that really needs to go.