Yes. You could have a second set of surround. The speakers layout would be custom in the AV10 speaker configuration. You would chose which speaker pre would act as the second set of surround.
They are videos on YouTube showing how to do it.
The RoomEQ (Dirac or Audyssey) will see it as its own speaker and EQ it accordingly. You get true independent control over each speaker. It's usually for HT with two rows configuration.
Instead of a 7.1.4 setup, you could configure a 9.1.4 or 11.1.4 setup.
For 9.1.4: You would have Front L/R, Center, Surround L/R, Rear Surround L/R, and four Atmos height channels. This adds a dedicated pair of "rear surrounds" behind the main listening position.
For 11.1.4: You could also add Front Wide speakers to the mix, for a total of 11 bed layer channels plus the 4 height channels.
The key is that the AV 10 has the processing power and the physical pre-outs to handle these extra channels.