A very very simple solution to all Fanatec PWTS owners to get your wheel working in this game:
1. Connect your wheel to the pc and switch it on
2. Press the connect button and the back button at the same time
3. Now the wheel boots in to the G25 mode (PS3 mode)
4. Download and install Logitech Profiler, make a profile for WRC and activate the combined pedal settings .
5. Start the game and select wheel and you good too go.