Welcome to the forums.
Just to be sure we understand what you want to do; iDVD can do these things:
- you can autoplay a video when the disc is first inserted into the player.
- after the autoplay, it will return to the main menu
- you can create a sub-menu the user clicks to access a second set of videos
- a user can manually click the videos on the sub-menu in the order they choose.
- menu buttons and the menu background can contain video.