My first vote would go with the SEOW..
Second would be a capture the flag style of game play.
I was also thinking of a mode of game play where Both Allied and Axis had ship taking off from there perspective coasts. If either one has a ship or ships make it across the channel.. then that side wins. the only problem is that the allied's only have one bomber. It could be done just with an allied convoy headed to France(with Allied defending and Axis attacking.( Farther the convoy gets out, the harder it would be for the Allieds to Defend) Simple concept.... and would be easy to do..
