I didn't think it could be done towerade, but don't quote me on it.
Since you are using phpbb as the user system, It operates as phpbb would I am assuming.
Well, I gotta say, i love this mod Jan, you are a legend. Also, for anyone else who wants to add a CMS to their website, and use phpbb and 4images, I use:
http://www.subdreamer.com/I have all 3 integrated, now i am just working on the templates to align all perfectly.
I also have the niggling issue on loggin on through 4images, but it send empty variables to the phpbb login page, but I will look for the code to fix this.
Great work Jan, Vano & all who contribute to this forum...