I like the idea of adding an incentive to boarding. As it stands right now, there is no point in boarding another player unless they are in a hauler. There does need to be an incentive to surrender instead of scuttling yourself. However, Crew should not be limited. Crew should not be lost when sunk. The last thing I would want is to have to constantly recruit more crew every day just so I can go pvp.
"You lose crew when you lose the ship (all durabilities)"I do not sail one dura boats anyways. So the whole crew as a resource would be useless unless you lost some every time you sunk.
I propose an alternative: Create royal sailors. Royal sailors are limited. They can only be recruited by nationals. They cost a fortune. They are lost when you sink, even if you lose only 1 durability. They are stolen in boarding combat, but kept if surrendered. Royal sailors can be recruited only in nation owned ports using labor hours and money. They are tied to the captain like XP, however they can be sold/traded. Royal Sailors give a small bonus to the combat effectiveness of the boat. for example increase reload rate by 3%, yard turn by 2%, boarding prep gain by 2%, etc. Small bonuses, but big enough that people would want them for their "end game" boats. Boats can still be sailed with regular sailors.