While I would agree that the JACKET_P file is a waste on more than 95% of DVD players, I don't understand why you wouldn't just use Nero or Roxio to copy the entire disc. What kinds of "errors" have you found with DVDDecrypter, and how do you fix them?
"Why not just copy the disc onto your PC, and then onto another DVD disc. Or, if you have two drives, just straight from one to the other?
On another note, I completely stopped using DVD Decryptor when I discovered DVD Shrink... so very easy to use in Decrypting, shrinking, or reauthoring... create piece of work."
Agreed. I LOVE DVDshrink. So easy to use, and make commercial DVDs exactly the way you want them (except for removing FBI warnings, but that's what IFOedit is for.

"True as that may be, it is not suggested, because then the files are not placed on the DVD in the order they should. As a concequence, the Disc will be "less readable" and the seeking time will increase."
DVDLab lets me put each file precisely where I want it. This makes for better transitions between menus.
"the EditDroid system, where this particular set got its namesake, is mentioned briefly in the downloadable "final chapter" pdf at the official star wars site."
Do you have a link for that?