If you look carefully at Apple's web site for DVDSP2,
you will see a screen shot image of what the Menu Editor looks like - this menu editor hides a LOT of cool drag-and-drop features, including intelligence about WHAT the asset you are dragging should DO, and HOW you can use it -
This allows you to drag a movie file, for example, and use it either as a Movie (and create a button link to it automatically), or as a button, or as a motion background!
It all depends on which selection you make from the new context-sensitive POPUP MENUS! This is a whole new way of working, which I think you will find WONDERFULLY LIBERATING - It promises to remove a lot of DUMMY WORK from the task of DVD authoring, making it easier to be creative.