you can use DVD Shrink for splitting DVD9 into two DVD5 discs. Although its a kinda workaround.
launch DVD Shrink -> Reauthor -> DVD Browser
Drag initial tracks onto left pane - usually one track would be .99 GB, so you can place upto four tracks. You can adjust compression settings ofcourse.
Click 'Backup' to make an image/burn it.
Repeat the process for the remaining tracks and burn onto second disk.
Caution: You will lose Menus with this method, but the movie quality will not be compromised if you dont compress it (obviously ). The disks will be compatible with standard DVD players as well.
And I love DVD Shrink because of two reasons :
-Its free.
-Its so small!! Its not even 1 MB and does wonders.