On the screen where you create your coat of arms, there could be another option to add a custom battle cry. This would be something you would type in, such as "For the horde!" that your crew would shout via text box at the beginning of a battle, during a victory, and when the rapid fire command is given.
The second suggestion, (which I threw in this topic because it's a simple one) is that the crewman's speech boxes on enemy ships become visible at the end of a battle. Because then you would be able to see the crew of the enemy ship mocking you/surrendering to you.
Also, I think there should be more taunts/mocks that crewmembers could say during a battle or a victory. :P