In addition to the authority to receive, process and pay claims, when delegated such representative or agency receiving delegation of authority shall, in respect to cases adjudicated under this part, and when so authorized by the Director, have authority to make lump-sum awards (in the manner prescribed by 5 U.S.C. 8135) whenever such authorized representative shall deem such settlement to be for the best interest of the United States, and to compromise and pay claims for any benefits provided for under this part, including claims in which there is a dispute as to questions of fact or law. The Director shall, in instructions to the particular representative concerned, establish such procedures in respect to action under this section as he or she may deem necessary, and may specify the scope of any administrative review of such action.