Pressy however can be modified to do all sorts of things. It supports long and short presses, and you can configure it to do all sorts of actions - call someone, fire up the LED light on the back, send a text and so on.
How does it work, though, and where do you put this physical button? The idea is simple - plug the little button inside the 3.5mm headset jack and the button is right on top of it, protruding just 0.7mm, enough for you to find it without looking but not really sticking out.
“Pressy - the Almighty Android Button!” is on Kicstarter right now and a simple $25 pledge would buy you one. Hit the source link at the bottom of this article to reserve yours if you like it.