A further idea for this gamemode I had, last night... A Quad Damage Panel in each base.
Obviously, not constant, but requiring co-operation between players. Say, an Engineer needs to wrench cells into it for it to work. It could only operate for say, 10-15 seconds consecutivly - any more and it goes boom for a minute taking out whoever is on it, and the engineer who's powering it?
Possibly also prone to spy sabotage in some way.
Just a thought, probably not a good one, but meh