Nick- We've actually addressed this a few times. At the end of last June, we were forced to change to a different forum software. What we had been using had declined in quality and even worse, in security. The Groups software was an aftermarket plug-in. Unfortunately, after making the switch, we discovered that plug-in is not able to be imported to the current forum software. We have been seeking a way to do the import, to date without success. Until such time as it can me made to happen, if ever, the Groups files are stored away safely.
If someone finds a plug-in for Xenforo, which would make it possible to add groups, (and bring what we have out of storage), please let us know. No promises here, but we can pass it along to Charlie for his consideration.