While this may not be an ideal solution, it should allow you to do what you want today.
Try creating two scenes. The first scene put the DVDLobby.swf into the backgroundFX layer. In the second scene you create, put the DVDLobby.swf into the OverlayFX layer.
After you've ran your script, send the following:
http://myServerDomainName:6246/command? ... yScene.mls
You'll need to use your server Name and other settings. Basically by switching back and forth between these scenes, you are creating the reloading of the movie database.
Like I said, not the smoothest, but does allow you to do what you want today without an update to DVDLobby.
Thanks for your suggestion though...I've added to our updates list.