ChromeDriver (with Chrome 28 or under)
ChromeDriver2 (with Chrome 29 or above)
Unfortunately, this is also not possible in IEDriver.
false will not result in any exceptions, but, it doesn't mean the browser can be started with this capability. Selenium is designed to ignore capabilities that are not supported by the requested browser. DesiredCapabilities wiki page states
A quote from IEDriver's developer in this StackOverflow answer: