Recommendation for a in-admin discussion plugin

This might not really be what you’re looking for but I embedded a Google Moderator forum in the WP Help admin menu section for a site I’m working on in response to the same desire:

// Google Moderator Admin Page
// Add the Menu Item in the WP Help Admin Submenu
function admin_google_moderator() {
  add_submenu_page( 'wp-help-documents', 'Q&A Support', 'Q&A Support', 'read', 'admin-google-moderator', 'admin_google_moderator_page' );
}
add_action('admin_menu', 'admin_google_moderator', 999 );

// Callback to output iframed Google Moderator page
function admin_google_moderator_page() {
  ?>
  <script src="https://www.google.com/moderator/static/moderator-embed-api.js" type="text/javascript"></script>
<div class="wrap">
  <?php echo screen_icon('edit-comments'); ?>
  <h1>Q&A Support</h1>

  <div id="moderator-embed-target"></div>
  <script type="text/javascript">
  var mod = new MODERATOR("{YOUR MODERATOR URL GOES HERE}");
  mod.width = 870;
  mod.height = 640;
  mod.embed("moderator-embed-target");
  </script>

</div>
  <?php
}