Well it should be fairly easy to sort out beforehand, it's easy to come up with a list of what's allowed.
Being a bit pedantic, only RC10s with the original 6 gear gearbox should be allowed as the Stealth gearbox didn't appear until April 1990. I can see that going down well in 2wd, at least it would give other 2wds a fighting chance.
Another suggestion if someone is feeling very wealthy, the Tamiya Egress. It'll cost you a fortune every time the front uprights just look at something solid