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That's fine if the keyboard mapping is the same for every game to the joystick. For instance, you can map commonly used keys to the 2nd fire button and other buttons on TheC64 joystick, especially important as the Mini doesn't have a working keyboard as standard.

Usually button 2 is the space bar, so I stick with that. I also sometimes map the up direction as button 2 so I have a jump button. Did that for Steel Ranger