The administrative director may adopt, amend, or repeal any rules and regulations that are reasonably necessary to enforce this division, except where this power is specifically reserved to the appeals board.

No rule or regulation of the administrative director pursuant to this section shall be adopted, amended, or rescinded without public hearings. Any written request filed with the administrative director seeking a change in its rules or regulations shall be deemed to be denied if not set by the administrative director for public hearing to be held within six months of the date on which the request is received by the administrative director.