On our client site we need to test the registration process and use the dummy gateway. Obviously we can't login and use the user group setting as it needs to be a new registration so we have some instances of real members putting their live details in to the form without realising - despite it being marked as DUMMY DO NOT USE. These then need to be chased up for payment.
Could the dummy gateway have an option to restrict it's use to an admin IP address only?
Just a suggestion based on recent experiences.