Section 4.4 Audience doesn't really make sense, it looks like a copy-paste fail maybe? Its contents are almost the same as 4.3. Also sections 4.3 and 4.5 (maybe 4.6 and 4.7 as well?) should be moved under 4.2 Beaker Architecture.
http://git.beaker-project.org/cgit/beaker/commit/?h=develop&id=b943fec5700f889ffd0402ef134135555377752a http://beaker-project.org/guide/Administration-Beaker_Architecture.html