how about instead of getting a new class add cars to the other classes such as putting replica's of cars such as starlets and pulsars so that everyone isnt just set to go race a f1 car as its easy have a race where there are say 6 different cars in same class and all handle differently and have different power output that way people have a choice. id rather struggle to keep the car in line doing a corner at 65mph than do the corner at 90mph and find it to be very easy..
When i go doing track days in my starlet there isnt a full track of starlets, there are evo's pulsar's tegs skylines on track and usualy i will see 1 or 2 other starlets on track at the most out of 25 - 50 people so why on lfs should there be 25 - 50 of the exact same car =)