xAuth auto permission group feature?

Hi.

Does anyone know whether xAuth has a feature that allows me configure it in a way that when a player logins/registers, he or she will be automatically added to a permission group? So I do not have to manually add them.
I'm using PEX. Also, I knew about AuthMe. I used it previously but encountered a weird problem so I decided to try xAuth but I can't seem to find that auto permission group feature.

Any help would be appreciated.