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I had a big a** long explanation written up for why it didn't work, and got hit with a DNS error as I posted it, so the information is lost.
In short, your first post is right in that it was not written for express. None of them are.
Essentially, anything that requires you to add code to any other file what so ever runs the risk of not working. Plug and play plug-ins should work OOTB.
The plug-in works, but not whil in XOOPS mode, only in Wordpress mode was I able to get it to work.
Take a look at wp.php, it's slightly different then what is needed for theme.php, single.php, page.php etc.
Anway, I'm done for the night.
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