Well FT is not, as some might think the font of ALL knowledge added to that it was posted here (I cannot be bothered to search for the post) that one member was able to change an award booking which did not meet the overlap criteria.
In any event I was able to change to dates of two three night bookings to dates more than two weeks later than the original ones at two different properties and a family member was also able to do to match my stay dates at one.

mike