[droopy]

Originally Posted by jackie_w

You go to calibre Preferences > Metadata plugboards and add a new plugboard for your calibre driver,
e.g. if you're using the KoboTouchExtended driver:

Format: any format
Device: KOBOTOUCHEXTENDED
Source template:

program: raw_list('authors', ', ')

Destination field: authors
Then Save plugboard

This plugboard will then auto-replace the ampersand with the comma whenever the Author metadata is updated on the Kobo.

Thanks, Jackie, for your reply, and for writing in such a way that a noob like me can easily follow.

Here's a screenshot of how my Metadata plugins window looks like now.