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MeSue - No. I don't have to copy or paste anything. Comments (the built in one) and My Comments (custom column) are totally independent of one another.
When I pasted Klaus Kastner's blog post into My Comments it had no effect on the Amazon blurb I had previously downloaded into Comments. If I were to download something else into Comments it would have no effect on what I have in My Comments.
My
Blurb label probably confused you, I've changed it to
Comments. Calibre does not display a label for these sorts of columns. So I type my own fake label. *
Attachment shows what it looks like in Metadata edit, I'm hoping it will make it clearer.
Not saying your idea's are not good, just saying here's what I do
BR
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I'm trying to figure a way to incorporate 'roles' into calibre, I found the LoC Relator code list which includes "blw - Blurb writer" which amused me. I've always thought Blurb was slang for Publicity Notes or something - but if the mighty US LoC uses it then...