No briefs, argument, or any formal steps will be entertained by the DOT decisionmaker after the rate conferences. The form, content and time of the staff's presentation to the DOT decisionmaker are entirely matters of internal procedure. Any party to the mail rate proceeding may, through an authorized DOT employee, request the opportunity to submit a written or oral statement to the DOT decisionmaker on any unresolved issue. The DOT decisionmaker will grant such requests whenever he or she deems such action desirable in the interest of further clarification and understanding of the issues. The granting of an opportunity for such further presentation shall not, however, impair the rights that any party might otherwise have under the Statute and this part.