Mix remaining crumbs with butter; press onto bottom of plastic wrap-lined 9-inch square pan. Refrigerate until ready to use.
Add boiling water to gelatin mix in small bowl; stir 2 min. until completely dissolved.
Add ice; stir 2 min. or until thickened.
Remove any unmelted ice. Beat cream cheese in medium bowl until creamy. Gradually beat in milk, then lime juice.
Add gelatin; mix well.
Whisk in 1 cup COOL WHIP.
Pour over crust.
Refrigerate 6 hours or until firm. Cover with remaining COOL WHIP just before serving; sprinkle with reserved graham crumbs. Use plastic wrap handles to remove dessert from pan before cutting into squares.