You are able to change thesem create new users inside of Piwik and so on. Have a look :)
<p>You're welcome to discuss about the Piwik-web-app for HDA here: http://wiki.amahi.org/index.php?title=Talk:Piwik
Source for Piwik web-app is the great PHP-System itself found at http://piwik.org
[More to come...]