The point is that MTA 1.0 can do everything Race could do and many many times more. If it doesn't do exactly what you want, you've got the source code for every aspect of it and are more than welcome to modify it to your hearts content. You could even hack around to get MTA:MA to work with 1.0, I doubt that would be more than a few hours work, though quite why you'd use it I'm not sure.