Nice list but think how long it takes for a small group of devs to get 1 thing of this list to work in the game. I think there are really good ideas but let them make a solid open world with navy, trade and pirates and then think of the gimmicks.
Excample:
Music - copyright... ok they can use free music but there are not many good, but you can turn on what you want on your own computer / stereo
Taller Masts - only more sail area or changed center of gravity also? (more heeling) Only stats change or changed ship model (rig, sails, masts)? Taller masts are thicker -> changed hitbox
Air Pipes - again: model or only stat change? Which stats change? Crew moral, less sick people? At the moment there are no crew moral and sickness parameters in the game. A crew that always got air pipes are used to it and only will get demoralized if you do not get air pipes on anew ship, right?
Things like:
Economy
Rank systems in the navies
Scaled Open World with weather system
How to get provisions? Buy all in every harbor or gather by an exploring party, which harbor / town will sell what? Will there only be a provisions parameter or do you have to select the cured meet, living animals, potatoes, vegetables, ... by yourself?
... are much more important at the moment and will take a very long time to work as intended. I don't say it is bad to have this ideas in the forum, but there are many new people playing that game who never wrote a "Hello World!" program or know how long it takes for an idea to end up working in a game. So be patient and enjoy the anticipation to the open world with working economy and then this ideas will perhaps get started to be realized.
George