Created attachment 194204 [details]
an example for point 2

1. The preview flips horizontally. I know you're aware about this one and are not sure about how to fix it yet, this is just for the record.

2. When you first click on the preview the boxes in four corners appear and the dragging starts, but the preview jumps so that the 0,0 position of the actor is where the mouse is. Once you start moving the mouse it will jump back to a more sensible position. I'll attach a screenshot showing what I mean here.

3. I say more sensible position because you anchor on the actor at the wrong place horizontally. This is probably because of the horizontal flip but if I start dragging the actor at 0,0 then it will jump to $actorwidth,0 instead. It's easy to demonstrate; it just doesn't drag normally at all and feels odd.

4. This can be completely ignored but wouldn't it be awesome (if possible?) if when you started dragging the preview from its location but didn't actually put it anywhere that it moved back to the original location smoothly instead of jumping back in one frame?! You've got two actors here I think so if you did the animation of the one being dragged and then hid it or something? Not sure.

The same could be said for placing the preview in a new square -- you don't line up the corners of the preview with the corners of the box, you just wait for the box to turn red to know you've gone far enough, but it might look nice if instead of snapping into position it glided in? Perhaps I'm asking too much here. Let me know if you want me to put this in another bug.