Pretty simple to strip DVD Lobby down - more complex to fancy it up - let alone how well hikarion has done it!
First, create a button on the DVD Lobby scene and label it "setup" and set the "ML Command Line" (in the upper right corner) to MLcmd: DVDLobby and var:DLsetupMode. Technically, you don't have
to do this, but you'll be editing text files and/or pulling hair out and/or posting and getting mad at me if you don't.
Next, go to Setup in DVD lobby and hit "false" on "Show Buttons" and "Y" to "Hide Remote" and "X" to "Title Text Size" then hit "save".
From there, you'll want to go through the DVD Lobby and see the various MLCmd and var: parameters to perform all the functions that were there by default.