I agree with everything you say. But that isn't to agree that flying "half rolls" was therefore a myth. Granted, it seems to have been much more of a manufacturer's speciality but I think it would be wrong to suggest that service pilots didn't perform them too, even if only for a few years.
I would genuinely be very interested to know if any former V-Force pilots out there can recall just what delivery profiles were flown. It's always been a very difficult issue to clarify (because of the (then) sensitive nature of the subject. Problem is that now it isn't so much of a dark secret, it's so long ago that nobody seems to remember much... or do they?