Pre-Cue on headphones and Main Mix over bluetooth/airplay on Ipad

Why is not capable DJAY 2 to Pre-Cue on headphones and Main Mix over bluetooth on Ipad? Basically is the same principle like in the MAC with the bluetooh speaker or via Airplay… Guys using a splitter, basically divide the sound in 2 channels, it look un-pro and by the other hand sound mono, so is not cool!