Yes, the Secretary and a self-governance Tribe/Consortium may negotiate into the model compact contained in appendix A additional terms relating to the government-to-government relationship between the Tribe(s) and the United States. For BIA programs, a Tribe/Consortium and the Secretary may agree to include any term in a contract and funding agreement under Title I in the model compact contained in appendix A to this part.
25 C.F.R. § 1000.163