Re: motor bike functionality?
I think if you want maximum pedalling functionality you will go for a build that incorporates a freewheeling hub or a friction drive you can disengage when not in use. I used a chine fire kit which allows me to pedal the bicycle with the clutch disengaged but I am still dragging the chain around the sprockets. The drag is not something oppressive but I am aware of its existance. It does not bother me because I got the bike for exercise anyway but someone more used to pedalling freely might resent the extra friction. To me, the motor is just a kicker to give me more range.