There is now a configurable permissions system in the mod, as of update 1.3.0. It's rather specific about syntax, so be careful to follow the rules to the letter.

Here's the default permissions file as a reference:

So what does this mean? Well, administrators have all permissions, moderators have a smaller set, and users have none.

The syntax goes like this:

The rank name before the colon (:) is for use with /setrank and is used in ranks.txt. It cannot have spaces in it and should consist of lowercase letters only. The "pretty name" in brackets [] that appears after the colon is what appears in chat when you promote someone to that rank. It can have spaces and can contain basically any character.
Each permission must be on a separate line, and it will associate with the group name above it.

Any whitespaces (tabs, spaces, etc.) before or after lines will be stripped, along with newlines. So, that means this is also a valid permissions file:


You can add any new rank you wish, so THIS is also a valid permissions file!

The only two ranks you must keep are user and admin. So that means this is not a valid permissions file.

That's it. Hopefully this was helpful. Have fun making your own ranks!