If you have a two-button joystick, you can also jump with the second button if the joystick is suitable for this ;)
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I do have a Suzo "The Arcade" which has two buttons which works on MSX. I did press that button yesterday if i'm not mistaken and did not do anything. So i guess it needs something special? A mod or? Which two button joystick do you use on your Amiga?
Does master system controller work on amiga by any chance? Or Amiga cd32 controller?
Answer my own question: Found this thread and seems master-system controller does work. With mega-drive there's discussion about safety). And perhaps 2600 controller could also work.