This works great, it can be hard to put an app in a folder because they reposition themselves as you drag onto it. I would also like many more apps to be able to be put into a folder. Great improvement though.
Very elegant way of performing this task. I remember trying this feature a while back, but got stuck when I couldn't figure out how to remove items from the folder. One thing I would recommend would be to have it also jump back if an app icon is dragged over the back button.