[xwiki-users] Objects of registered users stored in XWiki-space

Hi, By default users that register on a privat XWiki will be added as a document with a XWiki.XWikiUsers object in the XWiki space Also they become automatic member of the group XWiki.XWikiAllGroup. Is it possible to have all registered users (except the default system-usewrs like admin) in a seperate space? If you do so, will this cause problems when upgrading xwiki, which would be my main driver to consider this. If people think this could or should be a best practise... My opinion is that the XWiki space becomes cluttered with users and also the requirement to have read access on many important system objects in XWiki space can conflict with some groups security policy on users and peoples privacy Would it be difficult to migrate users to a different space and keep all the group memberships and authorizations and passwords intact? Gerritjan