The whole premise of not mixing carbs and fat together may deal with setting off an insulin spike with free fatty acids in the blood...however, an insulin response is illicited faster than how long it takes for the fat to absorb in the small intestines isn't it?
I dunno, as a precaution I don't mix...but EFA + regular insulin spiking foods don't seem too bad...flax oil doesn't really have anything bad in it that you'd be afraid of storing