Well u can leave classes, change stock car score and add new top times as different top time. there can be even 3 different type of top times: Class based, car based and all cars, and u dont need to change top time reward system, it will be just easier to get 50 top times
But in general good idea, balancing by changing score will affect races/urls but not top times. And if u add 2nd type of top times = per car. more players will use "slower" cars
But in general good idea, balancing by changing score will affect races/urls but not top times. And if u add 2nd type of top times = per car. more players will use "slower" cars