This is an experiment to see if a map would be clearer for the forum sub-pages than an inline.

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[[!inline pages="forum/*  and !forum/discussion and !forum/*/*" 
actions=yes rootpage="forum" postformtext="Add a new thread titled:" show=-1]]
<!-- show=-1 hack so we get the post form but not any inlined pages. On my TODO
     list is to split out the form functionality into a different plugin. - JonDowland -->
[[!map pages="forum/*  and !forum/discussion and !forum/*/*"]]