Config File
In addition to change the defaults through cli options cobalt allows to specify a config file (.cobalt.yml per default) where you can write these configurations in.
You can see a config file used by amethyst's website
Full Config File
source: PATH_TO_FOLDER
dest: PATH_TO_FOLDER
layouts: PATH_TO_FOLDER
posts: PATH_TO_FOLDER
template_extensions: ['template', 'lqd', 'whatever']
rss: PATH_FOR_XML_FILE_TO_GENERATE
name: Cool name
description: My awesome blog
link: http://example.com