config plugin by Rael Dornfest is cool, in that it allows you to replace or define settings for sub-hierarchies of your blog. However, it didn’t really work the way I wanted to for a static blog.
config reads config files from the directory being loaded towards the root (i.e. from the top down, if your directory tree is growing upwards). It was more useful to me to allow config files in subdirectories to override those in their parent, so I wrote
bottomupconfig which does just that.