Hi Benny,
do you mean double click in 2Ds view? Using that is selected image set as first and other ones are sorted regarding to the similarity.
If you want to select that image and work with that you just click once on that image and it will be open in 2D view.
Yes in the 2D view, my use case is : I want to select the pictures that should be disabled for texturing (for instance), so I do multiple selection but each time I select everything scroll.