The fixing and payment under AS 39.20.110 - 39.20.170 of travel and per diem allowances and of advances and recovery and reimbursement of travel expenses shall be in accordance with regulations adopted by the commissioner of administration. The regulations shall be uniform for all officials and employees, and all agencies and departments. The regulations shall also govern the use of public transportation facilities by officials and employees. The regulations relate to the internal management of state agencies and their adoption is not subject to AS 44.62 (Administrative Procedure Act).