new column view by dragging file (as in visual c++)

By 'drag a file' do you mean drag the tab of a file already open in ST?

Or something else?

If the former then I see the tiny win in not having to hit a key combo to create a new layout with an empty column before starting the drag but it is so tiny that I would prefer no to clutter the UI with it. The current way of getting a file into a new column is elegant and simple so I'd prefer to see ST stick with that.

Not saying your idea is wrong for you, just wrong for me.