In connection of the revision history plugin, you might want to show only edit notices for loggedin users and only for questions. For this, the following edit of app/format.php is necessary:
if (@$options['updateview'] && isset($post['updated']) &&
($post['updatetype'] != QA_UPDATE_SELECTED || $isselected) && // only show selected change if it's still selected
( // otherwise check if one of these conditions is fulfilled...
(!isset($post['created'])) || // ... we didn't show the created time (should never happen in practice)
($post['hidden'] && ($post['updatetype'] == QA_UPDATE_VISIBLE)) || // ... the post was hidden as the last action
(isset($post['closedbyid']) && ($post['updatetype'] == QA_UPDATE_CLOSED)) || // ... the post was closed as the last action
(abs($post['updated'] - $post['created']) > 300) || // ... or over 5 minutes passed between create and update times
($post['lastuserid'] != $post['userid']) // ... or it was updated by a different user
)
&& ($post['type']=='Q') // q2apro hack: ONLY Questions
&& ($post['updatetype']==QA_UPDATE_CONTENT) // q2apro hack: ONLY content edits, not retagging
&& (qa_get_logged_in_userid()) // q2apro hack: ONLY show for loggedin users
) {
Just a tip.