OK, so in the December issue they attempted to clear it up:
ROAD TIREThe SEB has decided, after considering member input, to retract the change which increased the Road Tire minimum required treadwear rating from 140. This will be reflected in the Supplemental Regulations for future National Tour events.
The SEB has also decided that for the Road Tire classes the following tire will be on the Exclusion List, effective 1/1/2013:Toyo Proxes R1R 195/50-15 size only
So my understanding is that if you run HS, you can use R-comps by default, or choose to use "road tires" that are 140+ treadwear (sans the 195/50R15) and run in the RT supplemental class. If you run STF, you have to use 140+ but
can use the 195/50R15.
If that is the case, then the 195/50R15 seems to be the best choice for those of us who have done enough mods to push out of Stock but aren't ready for Street Mod. Agreed?