Hey fsers, this is just my random idea when I had nothing to do. Please refer the chart and the instructions to see how I am thinking about the measurement.
Instructions:
1. For touch, at least 2 touch will be done for each move, even for a simple juggle, INIATE - RECEIVE.
2. For no touch, at least 1 no touch will be done for each move. Because a HTW-like move is included in every moves... well, except ATW and CROSSOVER. That's why the point 3 exsists.
3. ATW, HTW, CROSSOVER are not fit for the formula.
4. difficulty = no touch + revolutions - touch x 0.5
Welcome discuss. Here's one thought in my mind, we may adjust the weigh of touch from 0.5 to another number, depending on some more detailed analysis on the importance of touches.