In add to library window, when including an album by mistake, clicking in "X" to remove it, in fact it just get selected. You have to click twice to clear that album.
Yes this is be nature of a WPF application. What we will do is to set focus to the list with folders and automatically select the first one when an item is added so that you can click the remove button once only.
Yes, it will do the trick.
Solved in beta 12.0.2