Additional properties in User Properties view
Since UserService plugin can add additional properties, which were already built-in in Openfire ("ofuserprop" db table) and loaded by default, the User Properties view (user-properties.jsp) should at least let view the additional properties (read-only).
Additional properties can be everything. The property (name and value) can be set by User Service Plugin. E.g. IRC username, Notes, etc.
Can you share what additional properties do you mean?