Changing gears in the final gear box on a scooter

Has anyone ever tried this? If you have, did it improve you top speed or give you more torque?

I found this video on the 'net of someone doing just what I’m asking, and it explains why it should give you more top speed.

To me, this would be one more thing one can do to get more out of your scooter, other then just making adjustments to the CVT.