One thing you could do is sort by forum title (it's an option in the Options page), that way if you place advertising threads in a specific forum they will be grouped that way. You can make Advertising show first.
Except his articles, while read, don't get enough replies to ever be most popular. He's not even on the list. I'm sure the owner would pay for a custom version of this but it's absolutely essential for her that she get most recent topics. The advertiser posts a new article late Tuesday or early Wednesday and the digest goes out Wednesday morning at 11:30 am oso most recent would be sure to include his article.
This is her best advertiser so it's essential we keep him happy.