There's quite a few threads started on this, not sure what ever came of them though. It would require some homebrew work to put a menu in there probably--a bit advanced, not too mention bothersome just to save a few pennies.
I can always find decent CD-R for 25 cents or less a piece. Even managed to nab a few cakes for just a buck or so after rebates. Hell, Circuit City once had some 100 pk Jensen CD-R's in a cake for just $10 after rebate. At best prices for Quality DVD-R, you're gonna pay over 80 cents each in bulk--unless you plan to buy an @$$ of them at once. You sure this would really save that much money?
Just a thought....
If it ain't broke don't try to fix it! But, hell if you can tweak that bastard just a little bit more....hehehe.