If not wheel support, what about other controllers. I have an ageing Logitech Rumblepad 2 which is perfectly servicable still, and has all the same buttons and controls as an XBox controller but will not work without additional emulation software.
Surely I'm not alone here, but I have huge difficulty controlling these cars when all I have is full-on or zero throttle, and ditto for steering lock.
Maybe I'm just getting old but I have no idea how I ever managed to get the hang of Rollcage using just the keyboard, 'cos I can't do it now!
I'm clutching firmly at straws here, because I realise that adding support for any controller is probably just as involved as adding wheel support, but still...