I think Beery or someone included some sort of "die roll" thingy in one of their mods for retiring yourself as kaleun after some reasonable number of patrols, but I don't remember seeing anyone extend that concept to other crew members.
During my first career, when I got past about 8 or 9 patrols, I started releasing one of my senior officers back in port after every patrol or two to simulate them getting promoted into their own boats. However, I lost my boat (to some ridiculously uber-radar-toting WWI-era 4-stacker destroyer off New York, not because of my rookie officer replacements) before I got around to trying that with my regular crew guys.
It would be interesting to have more info about the turn-over rate among U-boat crews (I think it was pretty high) and then try to apply that yourself in port between patrols. It would certainly make the crew management part of the game more interesting/meaningful.
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