I don't think there's no plugin or module for listing forums in a wiki page, but you could try using PluginInclude on the page and include the tiki-forums.php page.
For the section headers, there's an option to create or select a section every time you create a forum and that's what creates the headers.
coming from experiences with MediaWiki and DokuWiki I recently installed Tiki 6.3 on my apache webserver and are very pleased with the package (although, well, I miss a plugin which renders GraphViz graphs like http://www.dokuwiki.org/plugin:graphviz on DokuWiki (this is not what WIKIGRAPH does, but rather you can provide your own DOT source to be rendered)).
In any case, thanks for the years of effort you put into the Tiki project.
I'm currently in the process of setting up the Forum function of my Tiki 6.3 installation and don't find a hint as to how I can include a forum list in a wikipage, and how I can insert a section header in a forum list (like the grey line reading "TikiWiki development" on http://tiki.org/tiki-forums.php?
Any help is greatly appreciated!