Assign controller probleme

Hello everybody.

This is the ting. On the object name eyeBrow3_R in the/ panle motion/ assign controler/ position list. I had 6 time in the avilable slot a position XYZ. Now i have to wire parameter, x, y and z axes, for each position slot, to slider in a other object custom atributes. My big probleme is, i want to do it in script but Ther is no way to no which position XYZ is what. Everytime i wire a axes it always wire on the first one in the position list. Is it possible to name doe's position XYZ so i can taget the one i want in script.

P.s. I am a french guy, sorry for my bad anglish.