switching "up" and "second button" is super simple, but that won't help people with 1-button joystick I'm afraid.
finally it wasn't too difficult so next release will support the same controls as the original amiga Elite GnG with 1 button joystick.
Ghouls'n'ghosts has been requested many times already. It is an even bigger challenge (which partially explains the bad port), plus I'm not too fond of that one, so I'll focus on games I want to see.