Where it would really make our lives easier is on carriers that we don't have an ID90 agreement with. Take Southwest for example. Not only that but there may be a time when my usual commute is full but say United has some seats. I can't get to HKG and back with a few days notice for a pass to be placed in my mailbox when I need to get on a United flight in the next hour and a half. Jumpseat agreements create flexibility. For the few times we would give rides to guys in an empty seat, it would be more than worth it.
My previous airline had an agreement with EVA. We only got one route with them, SEA-EWR. In return for that they got our entire network on the approved list.