Add your emulators in /home/retrofw/.retroarch/cores or equivalent home folder
Grab the retrofw cores from https://github.com/Poligraf/retroarch_cores_retrofw
Button combos
Select + Left and Right Trigger - quicksave, quickload
Select + left and right arrow cursor previous and next save slot
Select + down quit retroarch
Select + Y toggle cheats (Cheats already included)
Select + X fast forward if supported
Select + B rewind if supported
Select + A show FPS