Hello,
I'm not sure, I've never tried that. There are a couple ways to test it. Get some rewritable dvds and try it out. Also try it with a software dvd player on your computer first (though they play nonstandard dvds so it might not be a reliable test).
Also, you could always make another folder in the root directory (or the video_ts folder for that matter, I read in a post here that the drive doesn't read any sub folders). The extra folders would be ignored by the player. Kinda like the professional dvd's that include screensavers, interactual dvdplayer, etc...
Experiement and good luck. (remember the dvd rw, don't waste discs!)
Kevin