I see that "drag to collapsed status now is working. Is this still in progress? As another user mentioned it would be nice if the "collapse status" toggle was actually a toggle and not a button (it works like a button). If on, it should check whether you are emptying a status, and if true collapse after move. Also maybe vise versa (expand empty collapsed column when you drop - but I could see this bugging some users). Then it could work as a proper toggle.

Currently, I think you have to toggle it open to drag something into it. It would be nice if you could drag a task into a collapsed status, and un-collapse it when you do.