[Andreas]

@eXtremeTim
I think you can get rid of the editpost.php file edit.
Hookname: threaddata_presave

PHP Code:

global $getpost, $postinfo, $edit;
if (THIS_SCRIPT == 'editpost' AND $getpost['postid'] == $postinfo['postid'])
{
    //need to update thread desc
    $edit['threaddesc'] = htmlspecialchars_uni($edit['threaddesc']);
    $this->set('threaddesc', $edit['threaddesc']);
}