The idea has come up on the mailing list  for the addition of extra data onto the [[Special:Statistics]], this would be a good idea for a extension to handle if there was a hook present.
This hook would also presumably also be helpful to other extensions that wish to add their own information without having to manually edit the page.
. [Mediawiki-l] Special:Statistics and wikiFactor. - http://lists.wikimedia.org/pipermail/mediawiki-l/2009-August/031660.html
. [Mediawiki-l] Special:Statistics and wikiFactor. - http://lists.wikimedia.org/pipermail/mediawiki-l/2009-August/031678.html (seems to have spilt off in the list archive)