I've been experimenting with the LB issue and I found that nothing I can do with DVDFab will make a good DL LB copy. For splitting discs Gold is the best and Express works great for compressing to one disc. But neither can handle the LB issue to my liking. I tried using Gold to rip to an ISO and ImgBurn to burn but ImgBurn gives me errors 90% of the time when I try to burn the ISO files. I have had success with ImgBurn but too many coasters for me using that program. Don't know why that is but on my setup ImgBurn does not work for me.
I installed the trial version of slysoft anydvd, cloneCD and cloneDVD. If I rip to an ISO with cloneCD/anydvd and then burn with cloneDVD I get a perfect DL copy. The Line Break is in the same place as the original. On my players the LB works the same as the original DVD's Line Break. I've tried several DVD titles that I know where the Line Break is and this combination works for me.
I have a music DVD where the LB is between songs (as it should be). On the original there is a short pause and then the disc plays on. Using the above anydvd/cloneCD/cloneDVD to backup the disc the LB works just like the original. On this title I tried anydvd with just cloneDVD and the LB on this title was in the same place as the original (coincidence? I don't know) but on my high end DVD player the LB is barely noticeable. I can see it but it's faster then the original.