Welcome back!
I can't speak to the combo of Elec/Dark specifically, but I do have a level 50 Elec/Elec/Mu Dominator that is my main character. Elec Control is amazing IMHO and I've had difficulty playing other Dominators because I don't enjoy them as much as my main.
As far as Fly and Afterburner. I don't think anyway really sees Afterburner as a "must have" power. I have it on my Elec Dom mainly because I skipped a few (what I consider) useless powers in my secondary. It's a nice place for a Luck of the Gambler +Recharge and it's got a great animation. If you can fit it in, I recommend it, but it's not really a necessity.
Chromium Man Model Designations
I - Fire/Fire/Fire Blaster, II - Fire/Energy/Fire Tank, III - Elec/Elec/Elec Blaster,
IV - Elec/Elec/Mu Brute, V - Elec/Elec/Mu Stalker, VI -Elec/Elec/Energy Tank, VII - Elec/Elec/Body Scrapper, VIII - Elec/Elec/Mu Dominator
Co-founder of Riders of Apocalypse - Triumph Server
I'm (re)new to CoH - left back in Issue 11 - and wanted to try out a dominator. From my reading, Elec/Dark seems to be a good fit for me, but I was wondering if anyone had any good build ideas.
Also, I was curious about the change in travel powers. Is it standard on a Fly build to just take "Fly" or is "Afterburner" pretty much mandatory?
Any help you can provide would be great! Thanks!