3ds Max: MaxScript question

Hey I just DL'ed Rollin' 1.0 from scriptspot. It calculates the amount of rotation to apply to an object based on the distance it travels (like a wheel/ball rolling). The prob is there is no readme and I have no clue how to apply this script. Has anyone used this? Please help! If not, does anyone know how to simulate this effect? I know I can fake it but I need it to be accurate, maybe there is some formula (I suck at math). In any case if anyone has a clue, please let me know. Thanx.