It seems a bit opaque/confusing. Pretty soon everyone seems to be based on the same root 'genome' and you can't even tell which cars are 'yours' so to speak. Likewise, you can't wall off your own gene pool so that it doesn't get cross-contaminated.
We added the "Your Car" label which is mutated based on the current Champion of the World. We are working on improving the manipulation capabilities for Intelligent Design.