Noprobs,
I had the honour of working with J.F, though I'm a ground or 'sitting there' if airborne, type.
I take it from your post you know what you're on about, but I've seen film attributed to intake Momentum Drag, quickly developing into a very high rate of roll, and an unhappy ending ( beyond seat envelope / reaction time of the pilot ) - so even if a secondary effect of Intake Momentum drag, it certainly always seemed to me that the catastrophic roll was the bit to avoid !
I remember J.F. describing the shaker system - which he as you say was instrumental in developing, flying right on the edge repeatedly - as " a rather nice relaxing calf massage " !