I have spent half a day on this and had no luck. I know I've had this same version and at least used my Dualshock 3 with no problems. It detects my Wheel (360 Ferrari wheel) in the launcher and I can turn I can change views everything but one of the buttons behind the wheel accelerates and I cannot change it. I use joytokey all the time and I tried it first nope, I tried xpadder and x360ce, I tried uninstalling/reinstalling the game multiple times. I installed the game using Windows 9x, ran the game using Windows 9x, ran the launcher using windows 9x all with admin.
I read something that I found on google that you have to delete a input registry key in Computer\HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\SEGA\SEGA RALLY 2\InputSettings\0 for it to accept input changes and I thought this is it I'm going to fix it, but NOPE no joy. Any other ideas?