I just don't think it will work very well. people will be here complaining about their tribute going off cause they got switched into AFK while the paused to talk to someone about something. It just isn't a very good option. an overlay button or a quick toggle on off tribute with a color indicator attached to the Extended widow selector or group screen might be more effective. auto toggled to the AFK switch. ? just don't believe it would be effective and would generate more complaints.
