Yes there is this option for both players to use the cube since this is a "cubed" game.

People here (i think) speak about auto-pass in non-cube games. And players would have this as AN OPTION.
But an even more advanced feature could be auto-pass in cube games only if the player wants this. Since to double on such situation is at 99.98% of the cases, stupid. Personally i would sacrifice the rest of the cases, where a double when you can't move isn't stupid and lose the right to double in this 0.02% for the sake of all the time i gained without having to wait at the bar.
I guess i wasn't clear in what i meant about this advanced feature and when this occurs but it doesn't matter. The important thing is auto-pass in games where the cube can't be used.