I have been using zenphoto for quite some time and am very happy with it
I recently rebuild my server (arch -> gentoo) and put zenphoto back on it, but also decided to try out zenpages (for other content - esp since the httpd is serving other info)

I generate IRC stats (via some bash and pisg). At the moment (still building site) I have a page for the IRC stats that links to the generated pages

http://fluidmotion.dyndns.org/zenphoto/index.php?p=pages&title=IRC-Stats

What would be involved in making those IRC stat html files (will always be the same URL, even at month change) "merge" into zenpages
if it is some top&tail php I can bash-script that around the generated statspages (they get updated every 6h)

You could probably write a plugin/theme custom function and use that within the code block to print them dynamically.
Besides that I don't know anything about IRC stat files.