I would really like the ability to copy an email into another IMAP folder, being able to move emails doesnt really serve the same purpose for me.
We have a system that automaticly processes some imap folders to do certain actions if their is a message in their, for example create a jira issue/ticket based on the content of the email; once the action is complete the message is deleted by our backend, hence we dont want to move emails into these folders, we want a copy, to trigger the action.