I never used AS 3.0. But you can delay movies with creating an empty mc. In the first frame you stop it, than make a lots of empty frames after it, and in the last, you write your script. So the movie's need to play this mc (for example if you need 5 sec, and you use 20fps, make 20*5 = 100 frames). And when the 100 frames played, will activate the delayed action.