Is there an option to blacklist certain color codes? Like the dark ones? To keep the chat cleaned.

And not sure if this is possible, but a limit on the amount of color codes? So they can't make a rainbow name.

No. But you can differentiate between color and format (rainbow, bold, etc).

Thanks for your answer, then I'll just add it to the server rules. :)

This will be resolved once #1441 is merged.

What are the exact permissions? This applies to nicknames too right?

The permissions are essentials.<base>.<format>, where <base> is exactly like the old formats (nick, chat etc) and the <format> is the relevant format from ChatColor - for example, essentials.nick.dark_aqua.

Cool, thanks!