phil,
I haven´t tested this with DVD but we have tested this with encore-created blu-ray disc.
if you would like to create a DVD that wont have 12frames black at the end of your looping menu or would like to use AC3 5.1-audio you should look for another dvd-authoring-solution.
DVD Studio would be your choice on mac, or any other professional DVD-solution on PC.
sorry – no other choice.
cheers
danny