I'm using SDLMAME 0.108u4 with a Playstation analog controller. I mapped the wheel in crusnusa to the left stick X axis (axis 5) but when I quit the game and start it again it's mapped to right stick Y axis (axis 4). Weird... I'm about sure it's something about the cfg-files.
[Update] It only seems to affect the wheel (paddle). I've mapped the gas pedal to right stick Y axis - then, BOTH the wheel and the gas pedal became mapped to right stick Y after I reloaded the game.