This is a common graphics editing paradigm. When dragging/dropping if you hold down the Alt (Windows/Linux), or Option (Mac) key, then instead of moving what you are dragging, it copies it.
This would be great when copying nodes or entire flows. There is already support for Shift+Drag which just ignores the grid.
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On Windows it's usually Ctrl-Drag.
Would be great, nevertheless.
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Though real geeks use the keyboard of course. 
And Shift+Drag to lock to cardinal direction. And Ctrl+Shift+Drag for both simultaneously.
