I use this on Ableton sometimes, it would be helpful. I used it the other day to audition new midi parts I was triggering in session view and compare it to midi in the arrangment by automating the "on off" track button for the return track. I was able to compare the playing midi with the new midi I was creating in the session view. As with most Ableton tricks, it was a huge pain in ***, but it worked. Every once in a while, the need comes up to isolate something and pull it out of the mix, but still have access to the audio that it provided. You could also use this as a sidechain trigger, I've used the "sends only" trick for that as well, and also using trackspacer.
