I'm sure that this will be the wrong forum.. but here are my ideas what I want to see in SSE:
HMHS Britannic - also it will capsize when it is almost sank.
RMS Titanic - also it will break in half when it has almost sank, like in 1912
Submarines - they can also fire torpedos
the last idea, for the Mission Editior which is coming out sometime: a Test Mission feature, you can test the mission, also you can end the mission by pressing ESC, or to restart the mission you can press R, the Test Mission feature is a feature which you can use for testing your missions if they have missions
That's all I have to say.. I don't really have much ideas, but I am sure you like them