If mileage upgrade requests started populating the airport standby list, we Medallions would throw a fit. I really hope that never happens.

One thing I would like to see is for RUCs to work for anything in North America, including these routes. Standby GUCs would of course take priority over RUCs. I may be biased, because I'll be PM mid-April based on the bookings I've already made. Doubt any PMs would disagree with me, though.