Ok, since yesterday i've managed to get my hands on a usb cable for my official sony dualshock controller. Once again I've changed the VID and PID values in the .h file to match those of the controller and the sketch now says:
PS3 USB Library Started
Dualshock 3 Controller Connected
Bluetooth Address was set to: 00:00:00:00:00:00
but it's not responding to any button presses/holds. Please help!