I want to alter the way priveledges work for a specific implementation at work...I need to allow users to register, post, and add/delete links. I do NOT want them to be able to add/edit post categories or link categories (or anything else, for that matter.) Just links and posts. I've experimented with different user levels and whatnot (ver. 1.0.1), but it seems to be an all or nothing proposition.
So, if I were to go in and do some hackifying, what wp files would I be looking in? Just point me in the right direction, and I'll start poking around.