We could use the ability to solo a bus instead of having to select all the individual tracks in order to hear the mix.
As you can see in the image below, in order to hear all the tracks routed to "Break Mix" I have to solo each one. It's not so bad when there are 2 tracks but with big sessions this gets complicated. As you can see in that image there are two blank spots next to "Mute" and "Solo." These could be use for intelligent buttons that solo all the tracks being routed to that specific bus/aux track. This would require very simple programming and would make everyones workflow a lot more efficient.