We'll see how large the NASCAR following gets, but it would be nice to have a separate "general" Motorsports discussion forum for those interested in other types (Indy, F1, MotoGP, etc)
I can make a forum for each. I don't think a Gen Discussion forum for motor sports will be used often. It's not like most pro sports with one league and multiple teams.
I'll create a sub forum for the other motor sports you listed just as I did for NASCAR.