1)
If I have move tool I can hold ctrl and select layers by mouse draging.
I'm adding layers to selection if I am holding shift. (CTRL + SHIFT + DRAG)
But if you want to deselect layer you can not select an area by the mouse, but you have to click. Which is pretty annoying if you have a lot 1px lines already selected.
2)
Is it necessary that the selection causes disappearing of blue border?
Screen cast here: https://youtu.be/wVBvm-meDrI