There does not appear to be a way to add a second title, or even ad a carriage return to the title card.
As a workaround, you could always make a backdrop with the tile and subheading, in say PhotoShop, or AppleWorks, etc. You could even use iMovie to make a backdrop if you wanted to use the motion feature of iDVD 2. Just a thought...
Good luck!
<small>[ 06-21-2002, 09:11 AM: Message edited by: jcarr ]</small>