Agreed! And even if not practically useful, that'd be a great detail to immersion!
(in fact I sorely miss a lot of sounds in SHIII that were even MADE by the devs, but weren't written into the code and are thus just left in the sound folder - e.g. coughing, "we're all gonna die", etc.)
There is one thing that the interface needs most, and one that I hope it's getting along with new crew management - so-called macros. I think we need to be able to set our sub to run certain actions autonomously - say, dive/surface every x hours, radar scans, radio messages, go to course while zig-zagging, and so on. SHIII did get a 'default action for detecting merchant/warship/plane', but I think SHIV should develop certain auto-responses beyond that. My logic is that if SH is to be a captain simulator rather than a sub simulator per se, then please let us feel more like the captain and have an intelligent crew that knows what and when we want, without needing constant reminders
