I think an "Atlantic mod" for SH4 would be possible, but I also think it can be challenging (and rewarding) to play the American side. Especially if the early war defects of the U.S. torpedos and pistols are represented, and given the fact that U.S. boats were expected to take on warships. If the game incorporates some sort of system whereby the skipper gets "relieved" of command for failure to produce results - with faulty torpedoes to boot - it could be a
real challenge!