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I'm going to try to dive into the world of Unity's new input system and I hope I can offer input customization and even wheel/pedal/h-shifter support in the future.
About the drifting: I've been thinking about if for quite some time, but there's no easy way to implement it. The drifting mechanism has to be compatible with the tire simulation, and it has to be easy to learn, but hard to master. Also, I don't want it to be mandatory to win the races, but rather a way to be slightly faster.
If I'm going to try implement it someday, it will probably something in between drifting and trailbraking.