I'd love to know the same thing also.
But i wouldn't get too fussed with it mate, crew management seems to be fairly bugged in sh4. Not only can you not add officers because of some stupid notepad glitch, the efficiency of the crewmen seems to go against logic.
Even if you got the point of efficiency, you'd probably run into the same problem as myself where you can not add or even change any crewmen.
