window.navigator.webdriver exposes if a client is "controlled by automation". Potentially sites could treat a crawler differently based on the if the window.navigator.webdriver is true, leading to a crawl less representative of a real user visiting a site. The browser parameter of bot_mitigation already exists, perhaps enabling bot_mitigation should also spoof window.navigator.webdriver to be false?
In short, should this be spoofed to be false (or have there be an option to do so?)