Interesting idea. Mechanical systems can have a type of error where it just fights, alternating between under- and over-compensating, so robots have to take stuff like that into consideration. Maybe it tells the lens to focus just a bit nearer... and it's too near... so then tells the lens to focus just a bit farther... and now its too far...? You need some heuristic to detect that, or some sort of fuzzy logic, or some hysteresis (an acceptable band of error where you just shrug and go with it) or something...
Kind of way-off-subject but here's an idea: the viewfinder could REALLLY blur the things not in focus so you have no doubt what it's focused on. Wouldn't work in all cases but might help in quite a few.
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