fader deck switch in mappings

I would like to be able to map a right and left for the fader to switch between tracks.
This is somewhat possible but only works as switching the fader back and forth with two separate mappings(i want the fader to switch back upon release of the button mapped) For instance I am on deck A and push a button that switches to deck B upon release of this button it goes back to A.

I think being able to map one button or keyboard button to this function so that it could be used with an effect like a turntable brake or gater but then resume to the previous track would be great!
Hope this makes sense in other software this is known as a transpose button.