I hate the Lafree bikes(now owned by Giant), you are better off equiping your favourite electric bike compatible bicycle and fitting it with a kit. They are not as cumbersome as some people make them out to be, and I have the SLAs. Or maybe I just got used to them. I don't think you will want to only use human power, you have to use the motor. You can use it to help you accelerate and turn it off once you are up to speed. I do this all the time. Unless you are a long distance commuter(you should have a road style bike anyway, which isnt conductive to e-bike applications), an electric bike is a good thing.

Regardless, check out revopower.com, they are coming out with a gas powered hub motor model and I think you can probably register it as a moped in Ontario. It only adds about 15 lbs vs more than 35+++ for an e-bike. I'm gonna get me one once they become available next spring.