The only that has apparently 5.1 and sound something of radio interference in the back speakers it is when the ATC communications. I don´t know if it is a feature or a bug. How we create a vote thread?
Moved to wishlist to create a vote thread 
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Or better maybe say a 4.1 cause when you move the head in VR the central speaker can´t move with you, and with those 4 or more speakers use them regarding the direction and position of the VR HMD.