Saturation and Channel Cross Talk Emulation on the Main Mixer
Nothing wrong with new mixing tools and options. I'd like the ability to use the input level control like a gain knob on an analogue mixer to drive the SSL into saturation/distortion. And channel cross talk to the summing. Ideally with the saturation and cross talk both modelled on a real SSL. With the option to switch these features off if you want a cleaner sounding mix.
After experimenting with console emulations like Satson, Mixbus and VCC. I think these features make it easier to glue your mix and add some depth in a way similar to many classic records mixed on old consoles.