In reading Joel's posts, the difference between Joel's concept of a psychotrigger and a traditional clicker is that a traditional clicker is triggered when the bow is drawn to a certain point, which hopefully corresponds to the archer's full draw, whereas Joel's psychotrigger is triggered independently of drawing the bow.
One of the problems some people have reported with Joel's psychotrigger is that they can creep when using it, because there is nothing physically that stops them from activating the trigger while losing back tension, like there would be with a traditional clicker. While this is true, I think this could be a blessing in disguise, because it forces a person to concentrate on drawing the bow to the point where everything is lined up, and to be aware of maintaining back tension while activating the trigger. When a person learns to be aware of what his body is doing, I believe he is ahead of someone who just pulls until the clicker clicks without that awareness.
Since you, and not the clicker, determine when you are in proper alignment and ready to start the shot activation, the clicker can really be anything you want it to be, and it shouldn't matter if you're using a tab or a glove. One example given was moving your fingernail over a ridge on the riser, which could be done by anyone as long as they're not wearing a glove on their bow hand. I suppose you could have a clicker in your boot and set it off with your toe, if you wanted to. I prefer to stay away from things having to do with extra hand or finger movements, because I have a tendency to torque the bow and want to focus on keeping my hands and fingers relaxed.
I hope I'm interpreting Joel's ideas correctly, and hope he will correct me if I'm not. The main reason I would even presume to interpret them is that if my interpretation needs correction, hopefully we will all learn from it.