Possible new spec for passing vars like login to scraper. Essentially passing one scraper as input variables to another scraper. New syntax includes limiting the number of parsed values ("max"), parsing headers ("expect": "header") and "asInput" clause,

login.config.js

{
  "input": ["username","password"],
  "scrape": {
    "download": {
      "urlTemplate": "http://example-site.com/login",
      "headers": {
        "username": "{username}",
        "password": "{password"
    },
    "parse": {
      "expect": "header",
      "selector": "SESSIONID",
      "max": 1
    },
    "asInput": {
      "alias": "token",
      "inputFor": {
        "input": ["token", "searchQuery"],
        "scrape": {
          "download": {
            "urlTemplate": "https://example-site.com/search?{searchQuery}",
            "headers": {
              "SESSIONID": "{token}"
            }
          },
          "parse": {
            "selector": "li.item span"
          }
        }
      }
    }
}