Everyone using reverse should have a " this vehicle is reversing" speaker fitted for health and safety purposes. Mr Christophers should be read out in all available EU languages to be fair in the rules
Mark seriously... when have you ever seen reverse used in 1/10th onroad or offroad meetings?
it may not be a written rule as you have discovered but its been assumed for years that you don't have reverse in r/c racing... why is it now an issue?
At club level, when a kid turns up for their first meeting... the first time they get stuck in a hose and back up they get mullered by a faster car, and there are damages to either cars... seen it far too many times... plus the frustration when a marshal leaps in front of traffic to rescue a car to have it reverse and throw them into confusion whilst they are dodging traffic and getting in the line of sight for other drivers.
Have a vote on rule at first round briefing and result is decided by those that have shown up, paid and are keen for supporting series enough to turn up to race.