In essence, this feature would allow one to link various tracks with each other. As explained in the topic I linked above, this is especially useful when you come across a spontaneous mixover that sounds particularly well. Personally, my reasoning for this feature isn't so much the spontaneous side of it, as has been argued at length in that topic. The reason I would like this feature is so that I can have easy access to information to steer my live mix in multiple directions.
Thanks I didn't find the right solution from the Internet.