Will there be another indicator showing when both have been disabled?

Also, I'm assuming that X-drive is more effective when you leave the DSC button engaged?

I'm new to the X-drive camp arriving from Quattro and giving it a little boot with the throttle would ensure the EDL's would get engaged to get you out of a really tight spot. From what I'm reading about X-drive, the torque has to rely on traction control to brake the spinning wheel and transfer torque to the other? Not as effective as a locking differential, but works nontheless. If one could point me to a technical description of X-drive I'd appreciate that as well.