I understand and have tried all kinds of schemes to make that happen or to reduce the time lag between focus and exposure - Graflex SLRs, Sinar auto-stop down cables to the shutter than activate when you slide the holder in place, the string focus method, the slide projector method, the put them in a corner brace method, etc. It might be nicer with this in 8x10 if you could keep the focusing screen in your field of vision while manipulating the focusing knob but I am not sure if you wouldn't need to be 8' tall and have 5' arms.
It's also one thing to focus on their eyes and concentrate on that versus moderating and catching the expression of the entire face/gesture. My brain and eyes can't do both concurrently, so the old standard focus then moderate works the best so far....
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