I think I remember the double-click looking up (if set to "Look up" in program settings) a word in a UI language lexical resource (e.g., Webster's for English). Today I was surprised to see it open the top original language lexicon from double-clicking on a word in a Bible that has a reverse interlinear. Very convenient indeed. Perhaps I just missed this and it's been like this for a long time? Or is it a newer enhancement?