We decided to add an extra block to the game to do so - the 'jet stabiliser'. If you place them on the sides of a vehicle they'll use available engine power and fuel to reduce the roll of the vehicle, place them on the front and back and the'll reduce the pitch of the vehicle. You'll see more of them in the 'Starship Enterprise' vehicle shortly!
The bow thrusters are linked to the hydrofoil controls to surface and dive the sub- and it motors along nicely with 3 propellers on the tail and two on the wings (in case the ones at the back come out of the water during a dive!)
