For simplicity but if is clear i can change the readme to this:

    var options = {
      src: __dirname
      , dest: __dirname + '/public'
      , debug: true
      , outputStyle: 'compressed'
      , prefix:  '/prefix'
    };
    var server = connect.createServer(
      sass.middleware(options),
      connect.static(options.prefix, __dirname + '/public')
    );