This has been something that I have been thinking about for a long while, the ability to "leave crews" and "join crews" a perfect option to allow even better playing, and potentially longer play sessions, this can be made available on safer seas as well or be tweaked to work on safer seas without doing too much work.
Leave crew: This can be done at any time by any non captain player (the person who set up the ship for everyone else) and can only be done on outposts at the shipwright, by leaving the crew you have to select a new ship before you can do pretty much anything else, this includes leaving the isle and selling things, note leaving a crew isn't required to join a new crew directly this is only really done if you need to resize your ship either to accommodate more people or because your ship is too big (the main reason why I feel it should be available in safer seas)
Join crew: This can be done from any pirate ship providing the ship has enough spaces in the crew and also if the crew in question is accepting more members (this can be an option when you are setting sail, either in the same way you do alliances or by selecting "open" when you are setting up (or both if the players change their minds)) while joining crew and joining alliance might seem similar it has the added advantage of not being able to do friendly fire therefore making it easier to play with randos that are actually nice to play with
