More control over what is appearing in wp_head in order to stop site bloat. I'm not interested in being able to change code generated by plugins, but would like to determine whether something (a call to include a js file generated by a plugin) appears on a single page but not an archive/index page. i.e. if page is archive exclude code generated by plugin x. Although this might be something that needs to be targeted at plugin authors.
Maybe multiple wp_head; something like sidebar('n')?