You cannot have other racers umpiring the gates. This needs to be done by neutral parties (IE, people who do not take part in the racing nor have associates in the races).
Those watching the gates do not really need CDs, just a guncam. If any cheating is spotted (like cruising if that's against the rules, shooting etc but in particular cutting corners or missing the gate) the umpire calls it and takes a screen. Once submitted, should be enough to disqualify or otherwise penalise the infringer.
I quite like the idea of hiring mercs to shoot troublemakers to bits, but I do get the feeling this could just make it worse...
I'd really like to see a race happen though. My salvage frigate would be happy to watch a gate for you, I was even considering becoming a bookie:D
.:j:.Salvager - Junker Congress (Salvage Frigate) := Recipient of the Yanagi Defense Medal
.:j:.Salvager.VHF - Collector
.:j:.Salvager.B - Recycler
.:j:.Salvager.B2 - Waran
"Good news everyone. I suddenly and unexpectedly have job vacancies for an entire spaceship crew!"