GoCity controller settings PO8 to PO20?

[Phred2]

GoCity ebikes have 20 electronic control settings, what I think I've got so far are:
PO1=Screen Brightness;
PO2=Miles/Kilometer setting;
PO3=Voltage;
PO4=Sleep timer;
PO5=Level of Pedal Assist;
PO6=Tire Size;
PO7=Speed Governor;

PO8 to PO20=I haven't a clue.

Can anyone shine a light?