To answer LadyOh-
The "Munson Plan" is a snake to mouse weight ratio that provides the appropriate sized mouse to snake by using weight rather than thickness of body. Folks who follow the Munson Plan(courtesy of our own Roy Munson), swear it increases the growth rates of their snakes without increasing fat content of their bodies or causing lower musculature.
To answer the original poster-
No, I have never seen nor heard of a "Munson Plan" for BPs(to my knowledge, Dean doesn't own any ball pythons, and therefor hasn't performed the necessary calculations to create a plan). I follow the old standard; prey should be the same thickness or slightly smaller than the middle of the snake's body, which is usually the thickest part of the snake.
However...there is nothing stopping you from creating your own "Munson Plan". Simply weigh the prey you intend to feed and record it in comparison to the weight of your snake, perform the calculations, and extrapolate...