Some of the mentioned bugs are recorded and will be fixed later.
For the container UI, i prefer the UI stayed after the "Take all" or "Put all" buttons are pressed.
So player still can move back some unwanted items if there are such needs. The container UI will auto-close when player move out the container range so it won't be main issue.
There are an existing function to split items, that you can press left-shift before dragging the items to other slot to split it in half.
But i didn't mention this in game, so i guess not much people know about the function.
I will keep improving the rest of the mention content, thanks for the suggestions!