IMHO it would be much better to put an entry for the cookie manager directly in the Tools menu, and improve it to be more like the bookmark manager (with search functionality for instance).
This isn't useful for most people. And this is coming from the person who has been working on improving that same UI for Seamonkey. If and when an improved bookmark manager lands in seamonkey, it may be revisited for Firebird. As for the first suggestion... -> WONTFIX Before trying to argue the point, please read http://www.mozilla.org/projects/firebird/ue/philosophy/realities.html