Modificamos viewforum.php
Nos vamos al fichero: 
modules/Forums/viewforum.php  
He marcado en rojo "(is_user() && $is_auth['auth_mod'])" porque si quisiesemos abrir la opción atodos los usuarios, solo tendriamos que tocar aquí:. Sustituyendolo por 
(is_user())----- go to "End of forum prune" and add the next lines ---
Y detras de la función Prune añadimos:
Quote::
	 
//
// End of forum prune
//
If (is_user() && $is_auth['auth_mod']){ 
	$can_watch_forum = TRUE;
	$sql = "SELECT notify_status
		FROM ".FORUMS_WATCH_TABLE."
		WHERE forum_id = $forum_id
		AND user_id = ".$userdata['user_id'];
	$result = $db->sql_query($sql);
	if ( $row = $db->sql_fetchrow($result) ) {
		// user watching
		if ( isset($_GET['unwatch']) ) {
			if ( $_GET['unwatch'] == 'forum' ) {
				// user tring to "unwatch"
				$sql_priority = (SQL_LAYER == "mysql") ? "LOW_PRIORITY" : '';
				$db->sql_query("DELETE $sql_priority FROM ".FORUMS_WATCH_TABLE."
					WHERE forum_id = $forum_id
					AND user_id = ".$userdata['user_id']);
			}
			url_refresh(getlink("&file=viewforum&f=$forum_id"));
			$message = $lang['No_longer_watching'].'<br /><br />'.sprintf($lang['Click_return_topic'], '<a href="'.getlink("&file=viewforum&f=$forum_id").'">', '</a>');
			message_die(GENERAL_MESSAGE, $message);
		} else {
			// user not ask for "unwatch"
			$is_watching_forum = TRUE;
		}
	} else {
		if ( isset($_GET['watch']) ) {
			if ( $_GET['watch'] == 'forum' ) {
				$is_watching_forum = TRUE;
				$sql_priority = (SQL_LAYER == "mysql") ? "LOW_PRIORITY" : '';
				$sql = "INSERT $sql_priority INTO ".FORUMS_WATCH_TABLE." (user_id, forum_id, notify_status)
					VALUES (".$userdata['user_id'].", $forum_id, 0)";
				$result = $db->sql_query($sql);
			}
			url_refresh(getlink("&file=viewforum&f=$forum_id"));
			$message = $lang['You_are_watching'].'<br /><br />'.sprintf($lang['Click_return_topic'], '<a href="'.getlink("&file=viewforum&f=$forum_id").'">', '</a>');
			message_die(GENERAL_MESSAGE, $message);
		}
	}
} else {
	
	// no user but try to unwatch
	
	if ( isset($_GET['unwatch']) ) {
		if ( $_GET['unwatch'] == 'forum' ) {
			url_redirect(getlink('Your_Account'), true);
		}
	}
}
//
// End of forum watching
//
//
// Forum watch link
//
$s_watching_forum ='';
If ( $can_watch_forum ) {
	if ( $is_watching_forum ) {
		$s_watching_forum = ' <a href="'.getlink("&file=viewforum&f=$forum_id&unwatch=forum").'">'.$lang['Forum_unwatch'].'</a> ';
	} else {
		$s_watching_forum = ' <a href="'.getlink("&file=viewforum&f=$forum_id&watch=forum").'">'.$lang['Forum_watch'].'</a> ';
	}
}
//
// End Forum watch link
// 
--------- go to U_POST_NEW_TOPIC and add SERV_LINE
Por ultimo, buscamos la linea donde pone 
U_POST_NEW_TOPIC y detras añadimos una variable.
En nuestro caso esa variable se usa para mandar también el enlace de RSS del foro y otros sevicios.
Quote::
	 'U_POST_NEW_TOPIC' => getlink("&file=posting&mode=newtopic&".POST_FORUM_URL."=$forum_id"),
		// (rss, igoogle, watch forums...)
    'SERV_LINE' =>  '<a href="rss/forums.php?f='.$forum_id.'"><img src="images/rss2.gif" alt="RSS: '.$forum_row['forum_name'].'" style="vertical-align:middle;" /></a> RSS'.$s_watching_forum,