Kubota probably changed the switching mechanics when people (customers) started complaining. Million times I got to get up and off the machine to check something, if the thing stalled each time, I'd be losing it. Mine won't move either if I'm not in the seat. That's a good feature. If your's stalls just getting up I'd pull the switch and have no hesitation to do it.
My cub cadet has a mower deck kill for everything, getting up, going backwards etc. I yanked every one of them out. I can only imagine how hard it is on the clutch to start the mower deck every five seconds after a stop. All these switches do is keep idiots from doing stupid things. This POSSIBLY prevents lawsuits and you can't blame tractor companies for doing their best to try and prevent injuries but sometimes it just goes too far.