Developer was so kind to add in a ratelimiting feature upon my request, not even a day had passed since I opened the issue!
If you're running a whitelisted server then this is an awesome utility to take the manual work out of it. No more asking for usernames, running the command when you're online, etc. Now the players can just do it themselves.
On top of that the web interface looks great and is very easy to use.
Highly recommend this plugin and developer. :)