Repaired my Trip Button problem... I changed the OEM switch for a printer keyboard switch. It doesn't fit perfectly and the switch doesn't react the same way, but it works! I can now toggle from Trip A-Trip B and Lifetime. Used this tutorial to repair the switch :
Long writeup of trip button repair.
This is the switch I have used (very crappy quality pictures)... :
And a random interior picture :
Only little question, I've heard somewhere (in a MetroMPG thread) that you can reset yout lifetime FC. How? I've tried reseting it by pushing for several seconds the trip button in the lifetime display, and it does nothing. The FCD button, if holded for several seconds, deactivate/reactivate the fuel consumption AVG and graph bar.
I also removed the DRL, EPS and E-Brake lights from the dash cluster.