there's a loop in bbcode.inc.php where you can manually up the limit from 3 to whatever you'd want..

PHP Code
	 foreach ($codes_to_parse as $code) {
			list($find, $replace) = $code;
			for ($i = 0; $i < 3; $i++) {

that number 3 is the loop limit and although it applies to nested quotes, it really applies to anything nested period wink