In its discretion and on such conditions for the security of the adverse party as are proper, the court may stay the execution of or any proceedings to enforce a judgment pending the disposition of a motion for a new trial or to alter or amend a judgment made pursuant to Rule 807, or of a motion for relief from a judgment or order made pursuant to Rules 808 or 809, or of a motion for amendment to the findings or for additional findings made pursuant to Rule 802.