It’s quite simple to make whatever motion menu you like within your NLE of choice, then import it and use it as background in DVDa.
I do this all the time and it’s great!
Instread of a still, just be creative in the NLE timeline and make a motion menu that’s say 25-30 seconds long with music, then export as AVI or MPEG. I use Procoder to compress all my AVI into NTSC MPEG2 files then import into DVDa.
This method allows endless choices in your menus!
Have fun