When combined with the either &webcam or &screenshare, this option won't auto-load the camera/mic selection page. Instead, it shows the main-menu button for either the webcam option or screen-share option.
For some users, this prepares them better for the upcoming request for camera/microphone permissions; particularly useful if using VDO.Ninja as an IFRAME integration.
&intro&webcam is the same like &wc2.
&intro&screenshare is the same like &ss2.