Well I'm just testing it, unfortunately we cannot have it on another page, we must change the template for that, the purpose is to talk on the topic of the wiki page, without changing the 'official' content, see https://www.dokuwiki.org/plugin:tag#discussion for an example of what I meaning
by the way now each user can write his own page see http://www.nethserver.org/dokuwiki/doku.php?id=user:stephdl for example (in the upper menu, your login name is now a http link)