pascal, I have Audyssey product, but the dyn eq/vol, but I have the *impression that it will help you more easily enjoy discernable dialogue at lower volumes. IOW, I would have less hopes for reducing the annoyance of ultra compressed commercials.
There was a guy here at AH that chimed in, that actually does those commercials. He said he once tried to reduce the compression, and the employers were disappointed/angry enough that he was actually worried about his job, IIRC. Since, he unfortunately cranks the compression to the max.
But, since you can/will lower the volume and still hear your dialogue, obviously, the commercials will be quieter as a side benefit. Again, not exactly sure how it all works.
As for basic compression in the receiver, you can find those settings just about everywhere, even in your STB most likely. You can set that to maximum too.