Click to Focus, Focus Follows Pointer, Sloppy Focus.
All useful. But sometimes what I want is eye-tracking and Focus Follows Gaze 
however you will probably find it surprising how often you don't want the focus to follow your gaze, or how distracting that is (especially with overlapping windows)
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Yeah, I expect it to behave pretty badly. But sometimes it feels like what you want :)
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making the "sometimes" an "often" is how we have a product :)
End of conversation
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