Not a clue of the age of my bike, bought second hand, and the throttle is active, but it is very simple to change it, pressing + and - at same time puts it in program mode, and number 10 has three options, pedal activated (0), throttle activated (1), throttle and pedal activated (2) as to if guy before me changed it to (2) or if that was factory default I don't know.
If I could find a way to set it to throttle up to 4 MPH I would, but can't find that option, although there is a sensor on the crank and the motor comes in reasonably quickly I find not quick enough to start on a hill, I need to turn crank around twice before motor gets up to full torque, but on my wife's bike with centre motor the assistance comes in with a 1/4 turn, there is no question my wife's bike is far better with motor in crank rather than in the wheel.
I have changed from KPH to MPH but nothing else, it seems reading internet I can adjust all sorts, but I have 17 functions, but internet either shows 16 or 22, so not really sure if I have guessed right on what they all do, so don't want to take a chance, in case I damage some thing.
I prefer not to use the electric if I can, it is there so if I hit a steep hill I can turn it on, if one can alter the settings at any time, then I am not sure about legal position, turning it off by going into menu is really no different to simply not turning the throttle.