I do push cars off of boards with a foot. Sorry but I have a bad back and I'm not killing myself for your mistake. I do it gently and as long as the driver isn't being a throttle happy idiot, it works perfectly and for me is faster than picking it up. I am NOT talking about upside down here. Just nosed into a wall. Flipped you got to pick it up.
Now lets bash some drivers instead of marshals here
Drivers, stay off the throttle until all four are on the ground and the marshal's hand is off the car. If you yell at me because you gunned it the moment your rear tires touched and the thing does a backflip onto its roof, I'll throw your car off the track