Time stretching with the Alt/Opt key is a great way to quickly adjust the length of an animation, but it almost always leads to subframe positioning of keyframes. There are plenty of scripts out there to fix the results of this problem (I use KEYboard), but it would be great if we could avoid this problem all together by holding the Shift key after we start Alt+Dragging. Shift would be in line with the existing behavior of snapping keys to other keys, layer in/out points, and marke