Ok. I know this thread was open some time ago, but i want to reply
For most of your ideas, I need to agree. They are just great. But about tides, i think this one should appear in game, but should be constant during entire round - just to add some kind of driff to the vessels. As well with this, should be implemented possibility to cast the anchor.
As far as i know, the biggest vessels were not sailing under full sails most of the time. It takes a lot of time to operate with them, and in combat situation, more of the crew was working with guns, not with sails.
Capsizing is fun idea. It will punish does, who dont respect the power of the wind
But i think that it could ruin the game on public servers. I dont want to see my vessel capsizing beacouse of a mistake of one person on board, or by some kind of trolling.
Sorry for possible mistakes in english. I hope my post is understandable