One thing I don’t know how to implement in DokuWiki is the ability f ornovice users to start a new topic.
Explain to your users how links are essential in a Wiki. Pages need to be interlinked to not become orphans that nobody can find. To make sure every page is linked to another pages should be created through links. Let users think how pages relate to existing pages first, then a link can be created at the apropriate place, followed and the page can be created then.
See also faq:newpage-- DokuWiki mailing list - more info at http://wiki.splitbrain.org/wiki:mailinglist