Thanks, but I wasn't really concerned whether MOW participated, just whether it was a viable option on a practical basis and whether someone experienced with this route could provide insight as to the level of risk.
FWIW, I spoke to an advisor yesterday who said it was. She said the 4-night, Monday through Friday segment was available on Mar-3 or Sep-8. As I feared, there were no 3-night, Friday through Monday segments available, without a future cancellation. I tried to get an education regarding the mechanics. She could not get confirmation whether each year a set number or percentage of rooms were available for each week of each season. Lots of unknown. She also confirmed that each "half" could only be reserved 12 months in advance. Thus, I could soon book a segment during Week #9 for 2015 and then would have to wait it out until my next preferred week, let's say Labor Day weekend. Yikes, that's scary.
I'm assuming that since the company has moved on from the "weeks" format, they have no incentive to strengthen or improve this perk for the legacy folks. Still... I'd love to hear from anyone who has successfully used this feature.