For what it may be worth, I use the following ExcludeSyncFolders line:
ExcludeSyncFolders=(\\.(?!kobo|adobe).+|([^.][^/]*/)+\\..+)|(screensaver_old)
The |(screensaver_old) is what I rename the screensaver folder to when I disable the screensaver and that keeps Nickel from indexing the images.
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