Can it be implemented that units have to "accelerate" into a turn rather than just suddenly turning at 100% speed? In boats and other large units in particular, the effect is really strange looking and unrealistic.
Maybe implement a turnacceleration and turnbrake tag? I know it's not as simple as that, since the unit needs to know when to stop turn-accelerating and when to start turn-braking... and so on.... but if it could be done eventually it'd make the game so much better in appearance and gameplay.