Hi Niceshotz,
GV'sEngine = e (As with planes)
Gear up = q
Gear down = w
Push stick forward to accelerate (Or of no stick push mouse forward I assume) pull back to slow/brake
Steer with Rudder inputs when in gun position.
PT boats are the same except the throttle controls speed (Can't think why GV's don't work this way as well)
Think that's about it.
TTFN
snafu