Have you considered allowing wheeled ground vehicles to use the mouse scroll wheel for speed control?
TL;DRGround vehicles are currently slow, but planned suspension and environment-interaction improvements should let them go faster, so a ship-style speed limit is something they would definitely look at, and scroll-wheel control makes sense.
So the difference with current ground vehicles is the current ground vehicles actually don't go very quickly. So it's not as critical, but we do have several improvements that we want to do with ground vehicles. That's definitely something we consider, because at the moment the ground vehicles are kind of limited by the terrain and the current performance on that terrain, but we're looking at several improvements to the suspension system and the way the vehicle interacts with the environment to actually allow the ground vehicles to go faster. So we'll definitely look at having a certain speed limit around those vehicles in the same way that it works on the ships as well.
It makes sense in the gameplay sense, because we have the same scheme in FPS, where you use your mouse wheel to change your speed. And I see no reason why we couldn't do this on ground vehicles as well.