A Kill the engine and coast button

[steve0701]

Ignition switches are expensive when they wear out from overuse, so if a person wanted to install a push-button to break an electric circuit and kill the engine what are some circuits they could tap into? How about the wire from the fuse box to the fuel injectors? The proper solution should not generate maintenance codes or cause engine damage. (Naturally, no one should ever coast if they have an automatic transmission or anywhere coasting is prohibited by law).