Front derailleurs that operated in reverse of the normal direction (pull on the lever, derailleur moves in, push moves out) did not operate very well on the shift to the larger ring, depending as they did only on spring tension to make that more difficult shift. I don't know that they had any function other than making both levers consistent - pulling back always went to a lower gear, pushing to a higher one. I don't know of a front derailleur that is made that way currently, and certainly would not recommend it for a triple. Also, if you have levers with a trim function it would work in reverse.