In a small bowl, sprinkle gelatin over water; let stand 1 minute. In a saucepan, combine the sugar, cornstarch and salt. Stir in eggnog until smooth. Bring to a boil; cook and stir for 2 minutes or until thickened. Stir in gelatin until dissolved. Remove from the heat; cool to room temperature. , Stir in extracts; fold in whipped cream. Pour into crust. Refrigerate until firm. If desired, dust pie with cinnamon or nutmeg.