Kwiki is evolving rapidly. The current refactored version has just been released, so plugins need to be rewritten for the new version. I'm not sure that the author is fond of writing documentation, so the WikiGnomes on the site need to get busy. :-)
Kwiki probably has the cleanest Perl Wiki architecture, so if it can attract a critical mass of plugin and skin developers, it may soon surpass existing Perl WikiClones in functionality.