You can edit ANY dvd with Cyberhome CH1500, long as the dvd+RW is not full.

1- Get the DVD onto a +RW disk, I use "DVD Decrypter".
2- Add a few seconds of a new file, ie record a TV show live for a few seconds.
3- Stop wait a few seconds as the CH 1500 or 2500 does its thing.
4- Hit Menu button and there are the files in CH format ready to be edited and chapters to be added or deleted.
5- I did NOT make the dvd compatible.

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Results:
There was no audio on CH playback of the original file.
The few seconds of Live TV played normally on both DVD recorders.

Chapters were made and a TV ad was hidden on the original video.

A. On LiteOn Playback, everything seemed normal.
B. The added chapters worked on LiteOn 5001.
C. The TV ad was deleted ("Hidden") on LiteOn's playback.
D. There was no apparent audio problem.
E. The small CH file played fine even though it was not made compatible!

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Futher test with LiteOn & Sampo will be added to this lead posting.