In my view, customization is paramount in a game whose rewards are just cosmetic, the captaincy should expand this to the ships, make them more unique than they are now.
changes
Removing trinket limitations, I don't understand not being able to equip my ship with same trinket in all slots, not that I want to do that but it's nice to have the freedom to customize how I want, the more freedom to customize the more unique the designs will be.
Another annoying limitation is not being able to choose the tier of the trinket I want to display, it's not because I bought the last tier of a trophy that I want to display it with golden adornments, if I paid for each upgrade I should be able to change the tier I want display. It would be interesting to have one or more neutral frames, like the one on the merrick frame so you don't have to show your achievements but just use them as personalization.
Remove these limitations, pls
new customizations
Change the interior of the ship, the wood of the floor and wall, color of the barrels, carvings in the wood, curtains and carpets in the interior, model of the map, lanterns, harpoon... All this would give much more options to customize the ship, mainly the changes in the interior that today are very few.