Thats true and awesome! The only thing that is different is that if you move a little outside the bounding box of the rail curve, the profile automatically aligns to the profile and you can't edit any more. I know thats for the automatic alignment but in that example I showed above, it aligns automatically but not just does the sweep but moves the actual profile and from there you can edit. That idea is good, maybe in MoI by making a sweep it can copy the profile for further editing and the auto align function stop working after doing the sweep.