The problem is, that roll in real does not work that way. When you look into your screen and roll your head left and right, even quickly, you could still read everything because your brain compensates it. You also wouldn't have the impression that the world is rolling but you would know that it's only your head. If that would be ingame, it would have the impression that the world is rolling around, not your head. The same effect like looking through a camera and rolling left and right. Completely different feeling, and this feeling would simply feel wrong. Maybe this is what ankor actually meant.Maybe very very slightly and subtle would do, if at all.