1. Someone is already working on it... I don't remember the name but it's been vaporware for a while
Found it
Here
Applied force
This method monitors the forces applied to the pedal by the cyclist's foot. Sensors in the shoe or pedal measure the forces as the cranks rotate, and calculate the power based on the magnitude and direction of the applied force, and the angular velocity of the crank. Advantages of this technique include independent measurement of power for each leg, measurement of efficiency of pedaling style, and (depending on placement of sensors) avoiding the need to replace bike components. No commercial system using this technique is available yet for use outside a laboratory
So this could be something interesting, not for me though ...