If licensing is an issue, LFS still has room for more generic car styles.
Small Kart & Super Kart Electric and Gas
Stadium and Short Course Trucks
Dune Buggies & Jeeps (add long off road tracks)
Generic Nascar shape stock car.
Maybe an Aero, COT, and some vintage shapes.
Oval Sprint Cars
Trash Heap cars for smash derby and figure 8 tracks.
Mini Sprint cars
Electric Street Car, Tesla
Small Electric hatch
Monster Trucks - I can see a lot of city driving servers allowing one person to be the monster truck, and the rest RUN LIKE HELL FROM IT.
Various Drag Cars, that will NOT allow automatic trans settings.
This is a video of Scawn's spare bike: