I thought that this is the "Nitro Onroad" thread, not the "Electric Onroad" thread.
All jokes and sarcasm aside, "saucing tires" to me is for electric carpet onroad and 12th scale on asphalt that has limited traction. For nitro, just go with a softer shore and adjust your driving style a little.
I have been racing foam tire asphalt for 10+ years in both 200mm and recently 8th scale Lola-body and have never heard of guys "saucing tires" until this past 8th scale Worlds in Homestead. To me, this "saucing" thing is a slippery slope I don't think we want to slide down. It is hard enough getting racers to attend races on all levels to begin with. In my opinion, this is just another thing that will drive a few more racers to offroad (the darkside of the racing force).