I fired up demul for the first time a few days ago and attempted to map my DD wheel to the X axis. Didn't have any luck. The mapping menu automatically assigns some other button to whatever function I try to re-map. That's certainly not a good first impression and quite discouraging
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Furthermore, looking at the menu and the way it's setup, I'm willing to bet the emulator doesn't support actual steering wheels, and thinks you're using a game controller with an analog stick. This would explain the weird sensitivity with the steering in the Initial D.
There is no indication anywhere that the emu acknowledges an actual wheel and will set the rotation properly. I could be wrong and perhaps someone like Boomslang or maybe MrThunderwing can chime in with their experiences, but *IF* I'm right, I wouldn't be particularly interested in using my wheel in Demul, without real steering wheel support.