Your game username: Nazg
Details of your idea:
When docking from a Lighthouse, mooring fees take up a pop-up and user control to Accept or Deny entry into the port.
This should be toggleable by a checkbox in the pop-up, allowing the user to auto-accept the mooring fee. Pop-up can be toggled to appear again in the game settings.
As that would obfuscate the mooring price to the player, the mooring price should appear on the user screen before actually interacting with the lighthouse. On the interaction pop-up should be a decent enough UX.