I have a neutral switch on my tractor that the seat sensor is wired into. If it is in gear and you unweight the seat, it shuts off.
If you are bouncing out of the seat and causing the tractor to shut off, you are driving waaaaay too fast..
Nah, sometimes we’re going over rough ground.
I rolled down a steep rough hill commonly in my lawn-cutting days for my parents. Scared my neighbors. :-). Also got stuck on tree roots starting to poke through same. Once I pushed it off, it could start rolling and would be a shame if it didn’t mow while moving. Never get done otherwise!