I have just installed the freelinking module. This allows you to automatically create a link to a new page by enclosing some text in double square brackets. This sort of thing [] but nested two deep. I have set the filter to only work on wiki pages and the page created will be a wiki page. I have turned CamelCase off so you have to use the brackets notation. You may also use this to specify a link using this format [url|text] again with an extra set of brackets.

I have not tried mucking about with the search that freelinking does to see if the page already exists so at the moment you need to use a full url to be sure an existing page will be found.

I have also added a css class p.wiki_admin-note. I would like to create 5-10 styles to help to give a common look to wiki pages. I think it is possible to get these to appear in the editor style combobox. This message is inside an admin note.