I currently have mame and the readme says

AME input mappings:
As of version 0.5a, there is no INI file to reconfigure the keypad mappings.
Reconfiguration can be done via editing the osd_customize_inputport_defaults
function in xbox_JoystickMouse.c.


I can't find this file to remap the key settings is there anyway just to make my own INI file?