Interesting question (although i don't see any poll options to vote on, maybe the forum does not mean that by 'Poll'?).
I like realism, so most of the realism settings are set to on. I also like to feel i'm in the world the game is set in, so that means as little 'fast travel' as possible, which also means speed x1 direct sailing for most of my sea travels, and on the bigger map by setting that in internalSettings.h (this should be (if it is not) an in game menu selection?) or whichever file it is i need to get that
I don't play Ironman mode simply because due to a possible bug or some such i might need to access the world map for navigation (like to trigger the Oxbay attack video if it does not by iteslf) so the only non-realism settings i keep are in InternalSettings.h:
#define WORLDMAP_DISABLED 0
#define SAILTO_DISABLED 0
#define ONSEA_DATA_DISABLED 0
The first two are just failsafes due to potential bugs, and the last is because it's a game and the graphics are not that good, and my knowledge of the ship in game neither, that i need the spyglass to give me something!
I like a slow progression to XP gain for my Char and Officers, nothing breaks immersion (this is Age of Sail 1690!) more than speeding through the ranks like it's a arcade game!
I like the games default music, i think they really nailed it for the different parts of the game those played in, the new music is also decent, but the caribbean flavour of the original scores (espeically on land) were excellent.
I like dialog that is also realistic to the settings, with decent grammer suitable for the period! Again this is ALL about immersion into the games settings and world.
I like having difficulty making lots of cash, because of realism - i'm not a millionaire in real life either, and most people of the period in the games settings were not either.
I like combat to be lethal, because of realism, and having a foot or two of steel between the ribs, or a solid ball of unhygenic lead pass through you is going to spoil your day, as it should! So healing should only come from first-aid/bandages/rest....and (grumble) maybe some kind of healing potion (healing brew sounds better to me!).....because this is just a game, and having to spend 4 weeks in bed at the tavern might test even my desire for total realism! I do reduce the amount of HP gain you get via resting, the default setting is just way to fast! So in my game i really need those bandages and healing brews.
But mostly i love to sail................in 3D sailing mode and take my time to enjoy riding the wind for the best speed possible in the direction i'm hoping to go! The sounds and sights of this part of the game are great, even today, maybe the best of it's kind of game out there (the newer ones all become too 'gamey' or arcade like for my tastes)....all it is missing is being able to create the smell of the sea and the feel of the wind and sun on your skin
So in short, SLOW gameplay suited to the period, REALISM as much as possible. Those are the greatest strengths of the Build Mod to my mind, there are plenty of arcadey pirate shoot-em-up games (all constant battles and speed-boats pace) out there, there is only one Build Mod