Now that we get souls % and CPS % when ascending, it'd be nice to have an additional option that shows souls/CPS %. I believe this would be greatly beneficial to new players, too, because it'd be a lot easier to see the upgrade %.
Additionally if CPS/Souls ever diverge, you'd just have 4 toggles instead of 3.
For example, right now mine is 939 Qa, 2 UA. I'd simply want to add a third toggle for 9% Souls/CPS.