I gave what I thought was a definitive answer here having tested and seen the results.
Now whether your brokers software will allow you to correctly enter an nx for a short I would have no idea. I know Generic forced an update on Monday morning with the beginning of the new pilot list and mine works.
I thought my response was definitive too. Through BZ-X in Laser I can do it, although the Merril and OES NX routes do not work. It's most likely up to your broker.
Well, it's been a week, where are all of the sho cheerleaders? (I'm talking about discretionary, not systems or arb traders)
Did you find the easy profitable short trades in those 1000 stocks this week?