it'd be useful to have a smaller boat, the size of the 'boat' that is a component boat (mast is separate). room for a single engine would be nice too.
also for 'boat' and a longboat, it would be nice to have a boat launch that will raise and lower a boat, to use for ship to shore. swimming to shore is not great.
the boat crane would be one of these things :
Mind you this is for a dock. For a ship they generally pull the boat all the way up, it's lashed in and then it folds back onto the deck. I couldn't find examples from old wooden sailing ships but they were similar.