It's a bummer the helmsman qual is so useless. Obviously it's there for no other reason than immersion. It would have been a great idea, though, as someone pointed out, to have qualified helmsmen give you the top dive times as compared to unqualified seamen in the same place.
I didn't know you could have exhausted men in the command room and not have it matter at all. I guess I was just fooling myself that it did matter. Shame that it doesn't, but it's good to know, now I know where to stash three tired men while my qualified boys are getting rested up. Especially if it makes no difference to the operation of the compartment!