The wheel will be the same direction if you put the 直軸 on rear, actually this setting is for drifting only, and it has no problem for stopping the AWD.
I guess he is asking about one-way, not solid axle. "Same direction"? U sure?
If you put 2 one-way axles on the same car without modification, it becomes a FWD but it can still stop by the rear wheels.
If you modify the one-way axle in the rear so it aligns with running the direction of the front, it becomes a non-stopable AWD and you will find that it can't reverse.