+1: Sizes of components should be standardized (2S, certain sizes, 540 motor, etc) and the electronics should be suitable for the racing environment (things like a hard case and protection around as many as possible rotating and hot parts) - leave the rest to the companies and consumers to sort out.
Also, instead of a homologation list, you could apply a rule that if scrutineers don't trust the safety of your electronics, they are not approved to ensure everyone's safety. Sure this requires some guidelines so you can confidently travel to an event with only the set of electronics that's in your car, but consider this: Homologated electronics don't guarantee safety if they're not used well, and have some faith in it that the manufacturer doesn't want a reputation of injuring a high percentage of its users... so why use a homologation as your benchmark for safety? Fellow hobbyists working as scrutineers will be more than able to judge whether or not they would feel comfortable with a certain car near them in the pit area or when marshalling
As you might have noticed, I don't live in the UK... Where I live, the most used electronics are HobbyKing/Turnigy products. I don't consider scrutineers to be very critical about things, yet in my 3 years of racing I have seen only one LiPo fire because someone accidentally charged his battery pack at 3S - homologation wouldn't have prevented that, instead he would've just burnt away a more expensive battery
Anyway, he noticed the case cracked during charging and he had time to carry it away from the pit area, where it had all the space to sizzle and smoke as hard as it could. Also I've seen 2 or 3 ESCs go up in smoke, but I've never witnessed a car burn down, a motor disintegrate or someone get injured from bad electronics.
So sure these electronics pack a punch, but in my eyes homologation will not prevent the few accidents that do happen. Just think about everyone's safety when working on your own electronics, watch each others' electronics and make sure there's a bucket of sand in the area to smother a LiPo fire!