I was racing at Nationals when we had the limited number of tyres rule. I actually enjoyed it, it added another method of tuning your car, when would you fit your new tyres?
Changing weather conditions was a problem though. Also you had to be organised, you didn't want to be in a queue to sctrutineer your second set of tyres if you were on next!
The club did NEED more people to run scrutineering however.
G