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3. to have various config files already available within the image for different and popular controllers (xbox, ps3, etc). ie. to have a retroarch.cfg config file ready to use with xbox controller.

Hi, the auto-config feature of RetroArch is already activated. The config files are located in a subdirectory of RetroArch:

pi@raspberrypi ~ $ ls /opt/retropie/emulators/RetroArch/configs/
HuiJiaSNEStoUSBConverter.cfg  PS3ControllerUSB.cfg
JessTechColourRumblePad.cfg   SNES-to-GamepadDevice.cfg
PS3ControllerBT.cfg           XboxGamepad(userspacedriver).cfg

The config files can be generated with the “Register Controller” function from within the “Setup” menu of the RetroPie-Setup Script. Every configuration file that is submitted will be added to the Script.