This may not be the right place to say this, but...
What I'd also like to see is one GRAND vessel per nation added that is solely AI controlled and guarded by a grand fleet. Following current rules, it would be immediately sold to admiralty upon capture, and put back into service for the capturing nation. To capture it would cause bragging rights for the capturing nation, and inflame the nation that lost her. These vessels would always be at sea, and their location undisclosed. They must be tracked down, and when discovered, larger fleets would gather to either capture, or protect her. These battles would have much higher payouts, to encourage participation, and if captured, two or three ships of the capturing team would be guaranteed exceptional quality upgrades in addition to experience and gold.
This would probably fall more into endgame, but how exciting could/would it be?