From the Apps->Catalog->Installs screen, add a "Push update" option to the Action menu, letting me push the most recent app binary to multiple devices at once.

At the moment, I have to go via Devices -> Devices -> Apps and update devices one at a time.

My use case is pushing an RC version of the app to c 3-4 manager devices, and then pushing the same/approved version to many more client devices. All at once. (Without having to generate a spurious additional build version and using auto-update during the update binary process).