I often am playing something to a variety of different output options and then move rooms and want to pick up where I left off. The “transfer zone” function is great for this, but once you turn off the device in the original room, it disappears from Roon and there’s no way to transfer, since you have to start at the originating device. So I’m left going back to the original room and turning the device on, or finding the dongle and plugging it back in, or any number of things. Or giving up in frustration and posting here 
Can I have Roon be able to select removed/off devices when transferring? Also inverting the direction (making it pull, not push) would allow easy selection of disabled devices.