Re: Do I have to use pedals?
If you're talking about removing the pedals, don't. In many states that will make your bike a motorcycle in the eyes of the law.
As for not pedaling up to speed, you'll be replacing clutch components very soon by trying to ride it like a motorcycle. Also in the event of an engine failure/malfunction, you'll be pushing your bike home instead of pedaling it.
Age and Treachery Will Always Triumph
Over Youth and Skill & "Charlie Don't Ride"