of course you can! you can just combine the two DVDs into one in DVDRemake:http://www.dimadsoft.com/dvdremakepro/ht_merge1.php or http://forums.afterdawn.com/thread_view.cfm/201805 just follow the guide........ or you can put both video titles into DVDShrink: http://www.afterdawn.com/guides/archive/multiple_dvd_to_dvdr_dvd_shrink.cfm there are many roads to the promise land!!!!! take one!!!
of course you can, if you downloaded divx movies you can put up to three movies together in a dvd with nero, but the only bad thing is that tha movie quality will be low, and if you've got the movies from dvds, just put the main movie in it to fit two movies
you wont loose quailty with divx if you use TFM / CCE ! dvd's i would use dvd shrink and tmpgenc dvd author for a menu