Speed Sport Life has an article on S.C.C.A. Pro Solo (basically drag racing with corners) and it features a 2008 Shelby GT: Speed:Sport:Life Racer Boy: Pro Solo ? Drag Racing with Corners
Sounds like fun, I haven't heard of it being done near me though. I just started going to autocross events this summer and I did a track event at Limerock Park in a friends car. It would be fun to try the Pro Solo, I'll keep an eye out for any local events.