Avoid being stern raked. If you are sailing a large ship alone, and you get attacked by a couple smaller frigates with skilled captains, you should be VERY afraid. I have used a surprise to chain the sails, and then kill hundreds of crew off of a Bellona before (granted, the skipper of that ship was not doing a very good job of keeping me off his stern, and I believe he was most likely sailing a poorly built Bellona [tank fit, should never be sailed alone in the first place]). If you want to sail a large ship alone, you had better know what you are doing and have a darn fine build that can move when needed to. I have a couple Bellonas that I can confidently sail alone, I have even camped the Pirate capital with one ; but the only way I feel comfortable doing that is knowing I can turn well, have good speed, and still angle armor well enough to tank some damage.
More to the point of the post, having a magical "recover crew" button is a big no-no. I'm assuming that of the crew I take out of battle in a rake/grape broadside, about 30% of those are dead, with 70% being carried below to the ship's doctor for attention (works out just fine if you run the doctor perk). It would make sense for a few of them to return to combat (bandaged up, splinters removed, ready to fight again), but I'm not sure how many that should be....30% of the 70% that survive? I don't know. However, I don't like the idea of hitting a button and getting a whole bunch of crew back...it should be a process that happens over time: a certain amount of the injured men can be recovered in battle, with x number appearing per x minutes since they were "killed" (injured).
Just my opinion.