Turns out hyphens: none also triggered an error warning from the W3C validator. So I took that AND the adobe-hyphenate COMPLETELY OUT and stress tested the book by putting it on my Sony PRS-350 with font at XXL. No chapter titles got hyphenated.
Then I uploaded it to Play Books and cranked font to 700% ... that wasn't exactly pretty, but NO chapter titles hyphenated.
So I believe for practical purposes, using just the webkit, epub and moz properties will be fine without anything else. I know the stylesheets will validate with those and if 700% font size didn't cause something to hyphenated, can't imagine much would in practical use.
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