In this section “case” means any case where the Court of Appeal has power to order a new trial on the ground that damages awarded by a jury are excessive or inadequate.

Rules of court may provide for the Court of Appeal, in such classes of case as may be specified in the rules, to have power, in place of ordering a new trial, to substitute for the sum awarded by the jury such sum as appears to the court to be proper.

This section is not to be read as prejudicing in any way any other power to make rules of court.