Motorcyclist magazine did an excellent article in the early 1980's where they trashed the various steering myths. Keith Code did even better when he built his "No BS" demo bike. Youtube has videos showing it in action. Here's one example:
- Putting all of your weight on one foot peg.
- Digging your knee into one side of the tank.
- Shifting your weight to one side.
None of those things will allow you to quickly and accurately steer a bike. What does work is countersteering, and the most efficient way to do it is to push on one handlebar - right to go right and left to go left. You can achieve mostly the same effect by pulling on the opposite bar, and indeed you'll have to do that if you're riding with one hand, but pushing is much more effective.
For more info, I recommend the book, "Proficient Motorcycling", by David L. Hough. He discusses cornering on pages 49-62.