I dont know about Menus, but you can keep the intro on the disc.
When you are synching with GW or Audacity, Before you cut the intro, copy it, and paste into a new project, then save as mp3.
Load the mp3 into Windows Movie Maker.
Drag the mp3 into the timeline, add a begginning credit scroll, and i usually load one of JP's posters into the time line as well.
Save the project as DV-AVI.
Take the created video file, adn load it into Nero Or Roxio or any burn program, and save to a dvd folder.
Then in DVDshrink, click the reauthor tab, and make the intro the fitst title, then the Riff'd movie as the second.