Yeah I WW1 mod would be a great idea. The subs would be much more primative and the TDC would have to be replaced with slide rules and tables.
This is an interesting link about 'The first battle of the atlantic' -
http://en.wikipedia.org/wiki/First_B...f_the_Atlantic
There was some serious stuff going on for sure with several notoroius incidents, the sinking of the Lusitania, the sinking of Llandovery Castle, the Baralong incident etc etc.