^That's great. This kind of "automatic inverse compensation" functionality is applicable to a lot of different mixing tasks and should be especially useful for fine-tuning. The EQ balance between two sources is one good application. Get each sounding good on their own. Get the overall mix of the two sounding good. Then use that functionality to retain the same overall EQ balance while playing around with the mix balance of the two across the spectrum. A "tilt" EQ may be useful there, or one could dial in a specific curve to use more midrange from one source and less from the other or whatever without actually changing the overall EQ balance.
Similarly, I've wished for that kind of "trade-off" EQ for 5 & 7 channel playback to fine-tune the EQ balance between L/R C and the Surround channels.