Players vehicles are not supposed to be spawned in the ars area at the first place but yet players keep driving with their cars into the area, I don't see any benfit from this suggestion as long you can simply hide your vehicle and spawn it after finishing the rob, but with having an addition with something like this we will have many of unwanted vehicles everywhere and it's will be hard to control the situation because simply everyone would park his car inside the ar area, Negative.
I don't know why you press F button by mistake.
it's kinda annoying to fail the robbery directly, especially when you enter it by mistake