Cut cinnamon roll into half-inch pieces; set aside quarter-cup for topping.
Combine 3 cups of ice cream, cinnamon roll pieces (not reserved amount) and half-cup glazed walnuts in large bowl; gently mix to combine. Freeze at least 2 hours.
Warm apple pie filling in microwave-safe container or in small saucepan over medium-low heat. Spoon about one-third cup apple pie filling into eight serving bowls.
Top each bowl with one scoop (scant half-cup) of the ice cream. Drizzle each with one tablespoon butterscotch-caramel topping, several pieces of reserved cinnamon roll and glazed walnuts, if desired. Serve immediately.