(a) The board of trustees shall, by rule, establish, maintain, and administer a system and procedure for the arbitration, and may establish, maintain, and administer a system and procedure for mediation of disputes concerning fees, costs, or both, charged for professional services by licensees of the State Bar or by members of the bar of other jurisdictions. The rules may include provision for a filing fee in the amount as the board may, from time to time, determine. (b) This article shall not apply