I know you were kind of joking here, but you can place headshots with an inverted control scheme. At least I could in Turok 2. It helped that the N64 analog stick was the most responsive ever put in a controller (until Mario Party killed them all), but I never went for anything but headshots with the Crossbow in Turok 2, and I rarely missed once but never missed twice. It got to the point that no one would play with me actually since walking into my field of view resulted in an instant headshot.
Still though, too many console FPS games since have had slow, clunky aiming by comparison and rely too much on auto aim to let actual coordination and reflexes mean much of anything.