I’ll add one more thing to my wishlist, it would be great to have a composer button for Mermaid that could insert some example charts and have a link to the documentation site to make it easier for new users to discover all the functionality of the script.
I started looking for a generic toolbar customizer plugin to insert the snippets I need but it doesn’t look like anyone has made one. It would probably make more sense for each plugin to manage their own toolbar extensions anyway.