ramificatiopns of change to Auth/Auth.php

I'm playing with Auth (for now) and I made a small change to an internal method... function _factory($driver = 'DB', $options = "") This sets the default "driver'" type to DB. Does anyone know the ramifications of this? Will this come bit me in the butt later? I did this so I could do this... $a = new Auth(); so I can do validation of session without having to define DRIVER type. I figured, since driver type parameters are optional why not driver type itself. Looking deeper into the methods, I saw that loads storage classes based upon this definition. My first thought was to have the '_factory' method just bale out if no type is defined, but It thought that might break something I'm not seeing, so, I figured just default to 'DB'. But then I had second thoughts on that and now I'm asking those wiser than I. I really feel that all parameters to auth() should be optional, since AFAIK (or can see) they are not used beyond the initial authorization or new user DB (or whatever driver type) access. Please enlighten me. I'm asking now before I screw myself into a hole (again) and can't get out. Thanks Walter