Alas not possible with Elements. You need a program like Adobe Encore do more complexed menus.
The dvd menus in Elements are set up in a special way that cannot be changed. I tried changing the prefixes and things like that, but Elements won't have it. If you can work with Photoshop (I am not sure if you can accomplice this with Photoshop Elements) you can make your own dvd menus with your own designer buttons. Copy a menu from the dvd directory and study its structure.