Toolbar Button

Yes. Please take a look at the following tutorial.
https://www.wpfastestcache.com/features/clear-cache-link-at-the-toolbar/

Thank you. I don’t suppose you would consider reversing that, and setting it so people have to add rules to their wp-config to hide the button? I’m not looking forward to editing 40+ websites. Even a checkbox on the settings page would be better.

are you controlling them via WP-CLI?

No

Also, I can’t get it to work for custom roles.

which rule?

I have created my own custom roles: SUPER EDITOR, JUNIOR ADMIN. Both fall between EDITOR and ADMINISTRATOR in their capabilities. I’ve tried changing the slugs and whatnot (ie. supereditor vs super-editor vs super_editor), but can’t get your wp-config rule to work.

It would be great if the setting screen had checkboxes next to the roles and you could select which ones had access to the button.

yes, you are right. I will think about it and let you know.

I added the feature request.
https://www.wpfastestcache.com/features/clear-cache-link-on-the-toolbar/

you need to delete wp fastest cache and download the following version to get the latest changes.

https://downloads.www.ads-software.com/plugin/wp-fastest-cache.zip

Awesome, thank you!

please let me know after trying.

It worked, but in deleting the plugin and re-installing, I lost all my settings.

It worked, but in deleting the plugin and re-installing,

thank you for letting me.

I lost all my settings.

I am so sorry for this. I will add backup feature in the future.