Rule 4 - Assignment to Mediator(A) Parties may jointly select any person to serve as a mediator who has agreed to serve on a private basis. Such stipulation must be made within twenty (20) days after referral to mediation and must include a statement signed by the mediator expressing his or her willingness to mediate under the Mediation Rules. Alternatively, the court will assign a mediator to the case. (B) Mediators shall be compensated, unless otherwise determined by the court. All fees or expenses related to the use of mediators in cases referred to mediation shall be borne by the parties, and not by the estate, unless otherwise ordered by the court. Haw. Prob. R. app A R. R. 4