These would be very interesting values to see tested, particularly across multiple types of drivetrains. Just by playing around with numbers and their impacts, I am unsure if teams would be able to accurately measure the torque efficiency (Kf) and the rolling resistance slope (Krv). However, even just a simple rolling resistance (Kro) number, measured on different drivetrains, would be extremely useful.
The change in final speed and average amperage over a typical FRC distance (~40ft) just due to varying rolling resistance by 5-10lbs is quite substantial.
If time and work permits I will look into testing these variables before build.