It would be very useful if the commenton* parameters allowed specifying required text as a regular expression which must be matched in the comment. Examples would include: commentonresolved = Resolved in build| na |duplicate commentonclosed = Verified in build| na |duplicate commentonconfirm = . The later case would simply require any comment.
Most of these parameters no longer exist, and the goal is to remove the remaining ones. We are not going to add useless complexity to them.