(a) Generally. The appellate court may, on its own initiative or on motion of a party, waive or alter the provisions of any of these rules and enlarge or shorten the time within which an act must be done in a particular case in order to serve the ends of justice, subject to the restrictions in sections (b) and (c).

(b) Restriction on Extension of Time. The appellate court will only in extraordinary circumstances and to prevent a gross miscarriage of justice extend the time within which a party must file a notice of appeal, a notice for discretionary review, a motion for discretionary review of a decision of the Court of Appeals, a petition for review, or a motion for reconsideration. The appellate court will ordinarily hold that the desirability of finality of decisions outweighs the privilege of a litigant to obtain an extension of time under this section. The motion to extend time is determined by the appellate court to which the untimely notice, motion or petition is directed.

(c) Restriction on Changing Decision. The appellate court will not enlarge the time provided in rule 12.7 within which the appellate court may change or modify its decision.

(d) Terms. The remedy for violation of these rules is set forth in rule 18.9. The court may condition the exercise of its authority under this rule by imposing terms or awarding compensatory damages, or both, as provided in rule 18.9.