I have about 1,000 mp3 files on my DVD, in a nested structure. I've found that nested folders *do* work, albeit not in a very useful way.
e.g. I have, on the DVD itself:
artist1/album1/*.mp3
artist1/album2/*.mp3
artist2/album3/*.mp3
artist3/album4/*.mp3
artist3/album5/*.mp3
etc, etc. Unfortunately, COMAND ignores folders that contain only other folders, so COMAND presents me with only:
album1
album2
album3
album4
album5
with the upper-level artist* folder structure lost. However, all 996 files are still accessible. I need to put the artist name in the album title to have it visible in COMAND.
I also put the album year in the title, so that COMAND sorts the list chronologically.
I'm using a Linux system to write the DVD, using the growisofs utility, onto a Verbatim DVD+RW disc.
I use a burn option that "instructs the logical unit to explicitly burn [otherwise optional] lead-out.", which claims to "Provide maximum media compatibility with DVD-ROM/-Video."
If your burning software has this option, you might want to give it a try.