I don't know if it is in place in all kiosks, it is implied by the posting from chrisky that it is the case in YYZ. Each airport and kiosk provider for the WS shared kiosks have different software releases and potentially different functionality at any point in time. It may also vary depending on whether the airport has self-serve bag drop or not and the number of kiosks available at a given airport vs the volume of PAX.