It would be nice to have a hook to include files after headerinc cause now if I wanted to add a css or js file I would have to require the user to change his template file and that's not how plugins should work (or am I wrong ;) ), so it would be nice to have a hook in there.
Thanks for adding the hook, but you forgot to add it to the hooks list in admincp/plugins.php so I'm not able to add it to my plugin ;)