Section 129 has effect as if the following subsection were added at the end:
(2) The regulations may:
(a) permit non - national system employers and non - national system employees to agree on matters that would or might otherwise be contrary to an extended parental leave provision; and
(b) prohibit such employers and employees from agreeing on matters, or prohibit such employers from making requirements of such employees, that would or might otherwise be permitted by an extended parental leave provision.