Here's a thought:
Ability to change location of the personal Island, Move it, without destroying the buildings once in a month or so.
Why is this a good thing?
As of now, the center of the map is St.Jean, which means, most of the trades are happening in there.
Whatever is crafted or needs to be sold, the best bet would be to sell it/buy it from the auction in St.Jean.
Later game, higher level players I bet should go towards west right? Why not make Surako for example a late game port/ center for trade?
With the ability to move the personal island with all the buildings intact would allow players that are in late game to move from east to west and craft bulkheads and other heavy items in the west and transport them easier.
If not that It's just a QoL feature really.