Booma : the next version of megapad, 1.3.0, will allow you to bind anything to analogs, including mouse. I don't know how to program the gui on Linux, I don't have linux and the gui was very hard to program.
PCXL-Fan : I think pressure-sensitive buttons on a PC gamepad would be recognized as axes by the driver.
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If you're wondering where Mario__ is, he is currently saving Peach__ once again.