Hi @gibbylinks, although Tobii software does not currently support multiple eye-trackers connected simultaneously, you should be able to switch eye trackers by disabling the one not in use via the Device Manager in Windows.
To make this a more elegant workaroud, you could setup a script to automatically enable/disable the integrated Tobii device via Autohot key (https://www.autohotkey.com/board/topic/80762-disable-a-device-without-opening-device-manager/)
In the meantime, I will pass along your comments to the developers for consideration. Best Wishes.