Wooh, the latest build actually works in conjunction with other mods. The previous build only pressed keys which GTA can see, but a simple change allowed system-level inputs, meaning you can toggle other mods with your steering wheel buttons - like turning on the windscreen wipers in @ImNotMentaL's mod, or lowering the car from inside the car.
Of course not, it's barely a week old and I'm hard at work developing it. Try getting Joystick.exe to work and configure the axes yourself. If I could I would've put a few presets for common wheels already but nobody seems to know