Well, if it's on the to-do list, then I guess I'll have to be content with that

It's not a huge big deal, certainly not something I can't live with.
It seems odd, all the same. I note that if I edit the metadata so the author is `Darwin, Charles' then I end up with a directory called `Darwin_ charles'. It seems the comma becomes an underscore there, instead of a | in the PRS505. I wonder if this is some freakiness that goes on to avoid writing illegal filenames? Perhaps on some platforms a comma is not allowed in filenames?