why are you copying it to your hard disk if you'd rather just set it then walk away?
rather than selecting the "copy to hard disk" option, just choose the "dvd burner" option.
this is NOT considered on the fly as the program writes the transcoded files to the hard disk ANYWAY and THEN burns the disc.
insert the blank disc ahead of time, make all of your audio/titleset selections, then on the last screen select burn to dvd. select the dvd writer and choose the speed then click "go"
when you come back you won't even be asked to insert a disc (if you had already inserted one ahead of time...it will simply be done.
if you already have files on your hard drive that you'd like ot burn, use the third option on the front page of clonedvd2 (burn existing data) then select the folder and burn it to disc. the first way is the simple way though...you add an extra step by saving to hard disk then coming back and burning.