I saw someone on here talk about having mix snapshots, and I think this would be kind of similar but still a little different.
This would just be a "nice-to-have" and not a major request, but I really like how Izotope has set up their Undo in their RX software.
Every time you make a change or run a process to the audio you're working on, there is a little list in the lower right hand corner that lists those moves out step-by-step as you do them. You can click on any one of those steps at any time and RX will revert back to that point that you click on in the list.
I know there's a lot more you can undo now in S1, but I also think having a list to see exactly what you did would be helpful, especially for me when I accidentally move something, click on something or change it, but I didn't see what it was. At least if I mess something up I could refer back to this list to see exactly what was affected in my mix.