Ok, I am trying this hack on my development server which has NO traffic at all, and I can already tell you of one big pitfall in this hack:
The update-post-counters.php runs an UPDATE post SET ... query on ALL YOUR POSTS. With over half a million posts in my database, and for other websites with a lot of posts, this process will take A LONG TIME, and will eventually
exceed the execution timeout limit in php.ini (if not crash your MySQL!)
You MUST change your hack installer to run at X number of posts at a time (like the "update counters" does). You cannot just release this installer without making this modification, because it will not be fully installed, and most posts will show 0/xxx.
I myself can't even get the hack installed yet because I have so many posts in the db. So I don't even know what it looks like or how it works