Aha - that sounds like it may be the problem. Disney has decided that as a matter of procedure only pre-designated cabins will enter the 2nd loop, but if Doppelmayr's control system was not designed to recognize those cabins, cm's would have to push the button during the 11 seconds when a pre-designated cabin is the next to pass the track switch. To complicate matters, the button to be pushed might be at the wheelchair load position, which doesn't have a very good view of cabins approaching the switch.
Perhaps a control system software enhancement or a shuffling of cm responsibilities is in order. I understand the system does have the capability to identify which cabin is entering the station, by rfid, ocr, or barcode. (If Disney didn't purchase that option, they should.) They need either to add the capability to enter a list of designated cabins and have the system automatically switch out the next one, or to have a cm manually track their location so that an alert can be created to signal when the next one arrives. It's not insurmountable, but a human-based solution would require more manpower.