The presiding judge of a judicial district may appoint, subject to rules adopted by the supreme court, any qualified person, including a clerk of the district court, to serve as magistrate. A magistrate appointed pursuant to this section may be paid a salary as determined by the supreme court and has that authority performable by a district court judge as assigned by the presiding judge. The supreme court may adopt rules for the qualifications of magistrates, the extent and assignment of authority, and the conduct of the office, including rules relating to training sessions and continuing education.