Combine the wafer crumbs, pecans and butter. Press onto the bottom and up the sides of a greased 9-in. pie plate., In a large bowl, beat the cream cheese, confectioners' sugar, liqueur and vanilla until light and fluffy. Fold in whipped cream. Spread into crust. Chill until serving., In a small saucepan, combine sugar and cornstarch; stir in water and 1-1/2 cups raspberries. Bring to a boil; cook and stir for 2 minutes or until thickened. Transfer to a bowl; refrigerate until chilled., Spread topping over filling. Garnish with remaining berries.