Hi Nick
I think your on to something with the EEPROM. That might be in the right direction.
But the link with the ps2, I dont see how to use it for what i want, could you please explain what the intentions was with the link.? Cause the controller is gonna be used with a PS3, Not to control a robot or anything. Pure gaming, like the last link explains.
Would I be able to Program the EEPROM from inside a controller, without having to take it out.?
And would you know how to make a setup, and is it much writing code in it.?
Sorry for all my questions, but I am eager to learn. 
Henrik Andersen