This userscript allows moderators to use the "convert to comment" button even if the answer has comments. It also removes the annoying confirm() prompt when converting an answer to a comment.

You can find the source on GitHub (feel free to fork, improve and send a pull request) or just install it right away.

ChangeLog:

• 1.0: Initial release
• 1.1: Remove everything but the confirm() to reflect recent changes made by SE