When using Ctrl-Tag + Search, a new Command would List the Number of Search-Matches per file (... including in Branch, Showall, and Global views).
This List of the Number of Matches would be displayed "within" Megaview (Ctrl-F7), on the left, next to the File Name.
This List would be either 3- or 4-characters wide (up to 999, or 9999 results, max), plus a one-character space.
Then, if possible, another Command would 'Sort' these tagged files (search results) by the Number of Search-Matches per file.
Note: - There is a previous, similar suggestion:
[Q] Is Matches Per File Possible ... by JT Mares ... Aug 26,2006
http://www.ztw3.com/forum/forum_entry.php?id=82803
Bill