(1) In addition to any authority given to the trust, the trust has the authority to:
(a) Create a program description to further define or modify, but not decrease, the benefits of this part 4;
(b) Modify the contribution rates, benefit levels, including the maximum amount, consistent with subsection (1)(a) of this section, and structure of the benefits based on actuarial recommendations and with input from a committee of the trust consisting of representatives from labor, management, volunteer, and trust administration; and
(c) Adopt rules and procedures for the administration of the trust.