I've got it!
why not put in different types of racing all together? instead of making it single themed, why not have the ability to tune your car to the type of racing, like a RB4 suited for rally stages, MRT's for indoor racing, XFG races (like Clio cup races.)
they should also add prototype cars, (even if fictional) Super GT, Touring cars, drifters, Classic cars and muscle series'.
If any of you think this is a bit too much for LFS, remember that your gonna shed out another £12 (£36 in total!) for S3. It has GOTTA be worth it.