Thanks! It works. Now I can use AmigaOS and not feel it's emulated.
I don't mind it overriding the input mapping. In fact I find joystick mapper annoying most of the time as I boot Workbench and wonder why my cursor keys are dead. Then after ten minutes realise what it is.
I managed to sync a PS4 controller with Linux over USB and then wireless so I'm all set for a joystick or joypad. It's a lot easier to play with than my real joysticks. Can't say it improves my skill though.