I would like to suggest a better and faster way of re-crewing your ships and fleets. For many traders they follow which ever ports or (routes) that is the most profitable each market price updates. Obviously some routes are quicker than others and some are longer. Therefore you would need to adjust your crew so that your travel time is in near 1:00:00 Mark.
If we can re-crew a whole fleet (all five ships in that fleet) at once this would make our work a lot easier.
I believe this feature is needed as it will help not just me but an awful lot of people.
Expansion,
You tell (X) amount of your crew to take extended shore leave? You pay them a fraction of their wage as a retainer so your still paying upkeep, but they'll stay in the port you told them to stay up until you need them again.
This would mean at sea you could set it so your admirals will tell 50 crew to take extended leave in port. Then when you need them again they will rejoin your ship's crew or (x) number of them that you only need.
In theory, you could move crew from one port to another, but be paying a constant retainer, say 1-2 gold a day instead. Or an extra payment For them to move from one port to another.
P.S The Expansion is Shaydo's Idea.