I agree that we need a WWI sub simulator, the childhood of the submarine. I can't wait till the Wolves of the Kaiser is released
Things were very different back then when it comes to sensors and weapons. Their 'listening devices' (they can hardly be called 'hydrophones') were very primitive, and we do not want to talk about their torpedoes. Often the boats presented their own crew with more dangers than did the enemy.
Also it would be an aestetic pleasure to watch the old steamers and Dreadnaughts from early 20th century cross the oceans. There is just something about that era...