Avenger, do you have a link for the quote in #7.
Not that I have any evidence that the statement is incorrect, but as stated it does not appear to be consistent with either aerodynamics or certification principles.
Speed additives are normally associated with lift / control margin, where the wing is a dominant factor.
In addition the NG may have been subject to revised certification for flight in icing; there were also changes to autoflight approval in icing conditions.