I should mention that MY kill switch is not
based on these diagrams either ha ha. Infact, Im not sure that I like the idea of "push to kill" anyhow! It seems against the way that we "play" instruments. We tend to want to PUSH a thing to make a noise, not release a thing!
If we take the Tom Morello technique as ground zero, then you will see that he still uses a SWITCH.. not a button. of the demos I have seen of people trying to do that effect with a monetary button, they cant do it right (if they are after that effect, which I guess they are).
Personally I use a switch (Is is called 2 pole or 2 gang?) that switches from the pickups to a spare jack socket (an INput) So I can velcro things to my guitar (in my case Ive collected all the Buddah boxes, they are light and plastic and stay on with Velcro) and can switch between guitar and noise. OR I turn off the Buddah box for Kill Switching, or I can not play the guitar for Buddah box kill switching... I have a silver small flight case full of small device, like Walkmans, radios that I can insert into this jack.
I first saw THIS technique doen by my favorite Japanese Punk Band "Melt Banana"!! Before I had even heard of Tome Morrello actually, although was aware of his Rage against the machine band, but had found it not to my particular flavour of Tea.