Jeff,
1) Micro chords are not really 1/16th chords, are they? They seem not, not in a traditional sense. Using MC you can create interesting musical nuances, but that will be it. If I remember correctly, you yourself had made a nice diagram showing that they are "layer" chords, over the main chord(s). If this is the case, then there is no place for them in actual Chord Sheet as they are a "side" tool and a panel would be a perfect candidate for that. Perhaps an indication that MC is present a the bar? A colored dot or such. Also, I think typing in microchords in main cells with commas is a bit overkill, as instead of arranging you do sort of coding.

2) "Chord track as shown in Cerio examples is the way to go for serious work on entering chords." For Track View, ACW - Yes. Would be great! And yes, suggestion belongs in Track View thread. Chord Sheet is a different view and serves a different purpose.
3) I agree that 4/4 should have 4 cells, 3/4 -3, etc. Absolutely.