change the ray of the actuators constraint "Distance"

hi,it’s possible change the ray of this actuators with python??

i need change because the center of the character bound is below=


the center is here because,my character crouch with a Ipo curve=


so,no is a good idea that the ray of the actuators Distance is here

i need change the position of the ray of the actuator distance in the center.

help me

please