The idea of adding to groups is fantastic. However, this plugin is too limited.
Instead of putting the Group O-matic boxes on profile fields pages, it would better server BP users (and developer) if Group O-matic had a separate settings screen.
On this, all existing "rules" shall be listed, can be edited, deleted, and new rules added.
Also, instead of limiting each rule to a particular field, ideally a rule could have multiple rules within in related by logical operators OR, AND, NOT.