The afternoon before the last International Feast, Luda plugged in her food processor, pushed cubes of beef and lamb down the tube, and pressed the button.
While both the left and right mouse buttons do require a solid press, they're large and responsive all the way up to the apex of the mouse, and there's actually only a single spot (on the extreme upper-right-hand corner of the right mouse button) where it won't actuate if presseddown.