@Sailing_Nut i used to map "CANCEL UI" to "´select´ & ´start´" in AdvanceMAME.
This quits a game with the hotkey-combination we all know from the lr-emulators ;D
@1500points this looks like a good place to start more investigation...
Specifically... "Correcting the inner and outer deadzones of analog sticks for finer control and to prevent drifting problems in overly-sensitive or well-worn controllers."
@CrossCheck The advXYZ set of utilities (including the emulator) are installed in /opt/retropie/emulators/advmame/bin - see Advmame. You'll have to run them from a command line, outside of EmulationStation.