As Unwired says, you ca't do that directly on the Liteon. However Nero Recode, Power Poducer, DVDshrink (freeware), DVD Decrypter (freeware) and many others will allow you to extract the main program only and record it without a menu.
As a labour saving exercise (i.e. the press of a button), the above exercise is really rather pointless of course. However, reauthoring does enable you to write in DVD Video format rather than DVD VR format, which is better from compatibility purposes.