There is a setting falsely dubbed “brake” in the controls.
In reality, this defines the button for reverse.
What no vehicle actually has is a button that forces the vehicle to stand still WITHOUT GOING IN THE OPPOSITE DIRECTION.
I suggest that, just like in real vehicles, vehicles in Enlisted (including APCs and bikes) receive a brake button that quickly reduces the current forward/backward momentum of the vehicle WITHOUT adding momentum in the opposite direction. And, of course, that the current “brake” key is renamed to “reverse”.
That you will drive backwards. This is most important with tanks, where you cannot alter the vertical angle of your cannon as long as the horizontal angle is being changed - so you need to place your tank carefully on/between terrain bumps to change this angle more quickly.
Try it out and you’ll find that the burst of reverse momentum that you get will move you too far and place your aim off-level. Brakes could prevent this issue.
The same mechanic becomes an issue when placing your APC. I usually wiggle around between “Too close to capture points” and being too far from it for several seconds before being able to place the car directly at the 30/40/50/60m mark.