I ran into something today, a bug that seems specific to the treasure ship. I captured a treasure ship, but lost my sails in the battle (down to 0).
Heading back to port, I had a random encounter with a British merchant ship. On the battle screen, before any battle had taken place (and the merchant ship hadn't fired or anything), my sails were still at 0. And my only options were to submit or broadside.
I didn't want to attack as I was staying friendly with the British, and of course nor did I want to submit. I ended up firing a broadside, and the merchant ship tried to flee but failed (my rigging was still up at 10 or so I think, but what good is rigging if I don't have any sails? Shouldn't it have been about to outmaneuver me?).
After it succeeded at outmaneuvering, my sail rating went up to 1, intended behavior, I believe.
So, one bug is sails not being jury-rigged to 1 after a battle with the treasure ship
One suggestion is in addition to having options to attack or submit, an option to "wait" or "do nothing"
One perhaps unintended behavior is that an opposing ship can fail to outmaneuver mine when my sail rating is down to 0.
Thanks again. Good luck with your development machine!