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The scrpts I created are not completely ready to be released, however all I did was to create a couple of functions that check for the cookie if present validate against the database create a session upon success, if the session is present database authentication is not performed but the cookie detection is. If the cookie is not present then the session is destroyed if present and logout occurs, if cookie and session are present login is sucessful, logout is to set cookie values to zero. Login is through the form which checks the database and creates the cookie if sucessful. This allows for complete site login and logout functionality.
Then just used if statements to include templates login or logout and set variables to on for login and off for logout include different templates peform different functions depending on the values of those variables etc etc....
I also modified the registration form of minibb so that it collects the referring page as I have registration present on each page then once the registration is complete you can click the link and be taken directly back to the previous browsing page. That was just a hidden field added to registration form for http_refferer page then once registration is commplete it checks for the value and that is used to create the link.
There will be a way of doing it using the existing minibb functions however I found it quicker to create my own scripts rather than trolling through the code and troubleshooting any errors.
hope that helps.