I agree. If there's to be some reduction in morale due to a commander change, there should be some curve to it. Though unless it's been added to ships in C#, and I haven't noticed any such change, crew training rating of vessels doesn't change when a commander changes, so I'm not sure why one should be treated differently than the other. If the unit has no commander for a cycle, morale should begin to drop (and so should a ship's training rating probably), but otherwise I don't know that it brings a lot to the table.