Wind direction clues
I know you can always look up at the blue arrow to see which way the wind is blowing, but environmental clues are both more fun and more realistic. I'd love to see the wave-pattern on the water indicate the wind direction (fetch) perhaps with small white-caps. Maybe smoke rising from nearby islands and drifting with the wind and clouds moving according to the wind. Birds typically fly either into the wind or with the wind, but rarely across it. I'm not sure what other wind-clues would be good.
Graphics Textures on the boat
The white boat hull and the black non-slip material look extremely "flat" to me, like untextured polygons. I think it would make the boat look MUCH better if there is any graphical texture applied.
Add hands for grabbing the controls
For increased immersion. Could also have some minor items on the boat to be grabbed as well like a map or something.
Procedurally Generated Islands
This would give us infinite ocean to explore and keep the sim from getting stale.
Player weather option menu
Is there any way to introduce a selection of weather conditions In BBB as a player option menu for each voyage (or at least change the wind speed)
Allow switching of dominant controller - right now I have to use the right controller in my left hand, because I have limited right hand finger mobility.
Compass by Helm
It would be great to have a compass by the Helm to see the direction of the boat when steering. You can't see the map from there. Perhaps you could make the arrow icon bigger on the map so you could see it.