Hi @f3head, unfortunately we do not have a global hotkey setting to disable eye tracking system-wide.
However, as a possible workaround you could start/stop the Tobii Eye Tracking windows service using a 3rd party tool such as AutoHotKey.
The syntax is fairly straightforward in toggling a service state and binding it to a global shortcut key.
(an example here @ https://autohotkey.com/board/topic/20237-winserv-start-stop-or-query-a-windows-service-winapi/)
Hopefully this satisfies your needs.