how about add configuration to te package.json ?
it would be cool to use a custom css or to specify you don't want to overwrite the css if is in the _docs_ directory
(so you can make a new doc, change the css and you shouldn't care about future updates)
something like:

docco-configuration :  {
    css: "style/docs.css",
    overwrite_css: false,
    write_timestamp: false
}

would be awesome don't you think ?