I remember getting into a discussion on Reddit where someone claimed tagging on to a bus was faster by pressing the card right up against the card reader. Always felt like an abuse / misinterpretation of fits law to me.
If I understand your sentence correctly it's a bit of an edge-case (pun not intended).
When designing interfaces for a screen, the edges (assuming that moving the mouse to the edge doesn't cause scrolling) can be considered "infinitely" wide or tall for the purpose of Fitt's law. This is a really old insight:
Pressing your card against the card reader is the same idea: you don't have to be precise with your motor functions, because as soon as you hit the card reader you know you're close enough. So people can be faster with this approach.
(with that in mind, my earlier solution is actually wrong: the buttons shouldn't be put between the output and the code, they should be made sticky)
