I'm sure some who have actually proposed at WDW will chime in, but I would suggest, if they would like photos taken, perhaps hiring Disney Fine Art Photography or, simply alerting a PhotoPass photographer in their proposal location of choice, and they will take pictures. If they go the PhotoPass route, they should definitely consider purchasing Memory Maker so they can download all the photos. They could also pick up "I'm Celebrating" or "Happily Ever After" buttons to wear around the resort to alert CMs that they are celebrating something. There is really no knowing what the reactions will be as CMs react differently to all types of celebrations that occur in the parks each day. Pixie dust is unpredictable. If they are planning a special meal that day, they could also note the engagement on the reservation, order a special cake for the meal and/or order something from Disney Floral and Gifts to be delivered to the room. I, honestly, don't think CMs at WDW care if a ring is real or not.