Mike
I like the Classic Circuits, but i also like some of the new ones, as to what to put in, why not unconventional circuits like those that are not in F1, like Lime Rock, or Sebring, or even Hampton Downs, circuits that you wouldn't expect to run on, it could open up an entire new way to play the game by adding diversity and unpredictability, some cars would work on shorter circuits others on longer ones like twin rings for example, of course if you added in a lot more circuits you would need a revamp on the Design levels and other aspects of the game to make it more challenging and not have teams max out everything before the end of the season
I agree, it would be a good idea