[jays]

What I'd really love is to be able to (a) remove or (b) prevent from writing only certain custom metadata fields to the ebook file.

I use the Hyphenate This plugin which adds a boolean hyphanated metadata field. I would like for this field to be written only to the Calibre database, not to the ebook file.

However, I *do* want Calibre to write other metadata changes -- author, title, etc. -- to the file.

Is it possible to have this level of control over which metadata fields are written to the ebook file?