Personally, as a fairly active WG participant and reviewer, I would not expect an acknowledgement unless I contribute a significant new idea or a reasonable sized chunk of text. As an author or editor, my intention is to acknowledge people whose input led to new ideas or new text. Possibly, I'd acknowledge someone who found a significant error. I don't really think acknowledgement is needed for everybody who speaks up; fixing a typo or saying "+1" is not a contribution. Regards Brian