1. Make Knarr speed depend on crew quantity. Limit rowers quantity to 4 and 5th is captain.
2. Make possibility crew to choose will they row for increasing speed or, for example, shoot from board.
3. Forbit shooting for captain and rowing crew
4. Maybe add some new supergrids as in world 7? With sea-island terrain type, in whitch will be localized resources.
5. Ehm, boarding?