This has been brought up so many times...
All the proponents of Rock & Metal think it's good idea, EF staff seems to think it's not.
So the only chance to really get it done is to volunteer and make it require as little effort as possible from EF staff. You can't expect them to do all the work for you. With all those additional extra days the con has now, though, there ought to be some kind of timeslot for it. Personally, I don't think it's necessary to have three techno-focused music events.
And maybe finally having an alternative event would get us some empirical data, at last, whether (a decent, sufficiently mainstream selection of) Rock music really is such a party crasher.
I'm dying to find out.