The chief justice shall consider all recommendations of the court administrator for the assignment of judges, and has discretionary authority to direct any judge whose calendar, in the judgment of the chief justice, will permit, to hold court in any county or district where need therefor exists, to the end that the courts of this state shall function with maximum efficiency, and that the work of other courts shall be equitably distributed. The supreme court may provide by rule for the enforcement of this section and section 480.17.