Of course, there's nothing to stop the manufacturers programming in different modes, imagine speed limits, sports modes with higher torque and lower battery life, etc, etc. If some such "The operator is prone to seizures" mode were to exist, to require more prolonged sustained input from a user, or to move very slowly, after "double inputting" an intent, I can see this being quite safe, a "lean forwards twice to toggle moving forwards at 3mph" may well be a totally acceptable interface for some subset of people.

It wouldn't be hard to put bluetooth on the controller and tell it "this user is a seizure risk" vs "this user is playing basketball."

perhaps a "free movement" mode? (kinda like ABS on a car)