My bike just has a cadence sensor but it works well for me since I changed to a 11-28 freewheel because PAS1 works with 6th gear @13mph and 60ish pedal RPM and PAS2 7th gear @18 and 60-65 pedal RPM
Amazingly by adding pedal power to the motor stretches the mileage by about 40% in PAS1 or 2 and it feels natural to pedal.