Actually, I would like to see the crew management expanded somewhat. I'd like to be able to define the watches and allow it to run without my intervention. So, either in port or at the start of the patrol, you drop crewman into a slot for the various watches, decide who the torp room crew will be etc and let the computer change them automatically at the correct times.
It's only a little thing but would take the sting out of manually do it. I would also like to define exactly who is the 1WO, 2W0, navigator and so on, but then, I
am a geek.
Edit: I'm stealing ideas again...
:p