This started off as wanting a quick way to transfer eq settings between channels. It suddenly struck me that it would be great if you could grab the [eq] button on the mixer and drop it on another strip.
Then it struck me that you could do the same for the [ins] and [send] too. Being able to move/copy entire chains in this way would help alleviate this little gripe I was having recently: http://www.steinberg.net/forum/viewtopic.php?f=91&t=17748
Or have a track list (as available elsewhere) pop-up on right-clicking the button.