When NW had rollover miles as one of the choices for "Elite Extra Perks" there was a footnote that you could only choose that option once, no matter how many levels you reached. It wouldn't surprise me if the "Benefit Choice" had such a footnote (maybe something like you have to choose two different benefits -- that would also handle double gifting)

And I though the OP was pretty clear that people who fly 125K+ will get to choose both one PM choice and two DM choices -- for 2010 at least. I think that is a bit of compensation for a shortened DM year.