I would like to suggest a new order of souls shop system that allows players to buy staves, fire balls, blunderbombs, skeleton bombs, the ashen skull (The one that releases flames), and the horn of fair winds using either doubloons or gold. With the caveat that these items can't be sold off to anyone and some are sold in limited amounts (Like the skeleton summoning bomb).
This would make the order of souls unique as they deal with selling magical items that deplete over times and allow crews to have a crewmember that specializes as a pirate shaman or mage.
I would also like to recommend a new item, potions. These potions can be drank to provide different effects. One potion that could be used inside the order of souls shop is the invisilbity potion which will make players invisibile for a limited time, however, this effect is immediately removed if a player attacks. It would be a good addition for those who like a stealth playstyle. Agaisnt npc enemies, it immediately stops aggro allowing for the use of the mimic dart.
