If it's annoying, it's grounded. Plane takes off and flies one circuit. The announcer says, "OK guys, yeah or nay" All pilots are given a big card that's green on one side and red on the other at registration. If the majority hold up the green side, the plane is allowed to continue, If red, the plane must land within 10 seconds or it gets shot down by a freq tweek. You couldn't use the spectators response because we all know that the typical non-rc spectator would like to see a good crash every minute or so.
Moral of the story...if it's electric, it had better be manly! Maybe if there are 5% edf's at an event. Then they get to fly at a designated time or two that equals 5% of the entire day's flight window.
Example. Say there's 10 hrs. of flying and 100 registered pilots show up. 95 have turbines and 5 have edf's. The edf guys get to fly for one-half hour at 7:30 PM without any annoying turbines in the air at all.

Gosh, I hope my sense of sarcasm is picked up on or I'm gonna be a dead man.

I do have to say though, that it just ain't right to have a small edf in the air when one of the spectacular Yellow Twins is out on a sortie. Just trashes the video. And for that matter, I've had the soundtracks of the most beautiful footage of awesome turbine aircraft completely destroyed and unusable because of a whining ducted fan engine startup in the background, or a buzzing edf's awesome flyby. I know, I know. Go to a private field if you want control of the flightline for your stupid moving pictures shooting and stuff.

We all need to get along. But some more than others.

Hope this didn't clear anything up for you.