So most AWD drive cars recommend front to back only rotation. Seeing that the GS AWD operates as rear drive most of the time, would it hurt to cross rotate these tires (assuming a non directional tire, P7's in my case)?

Front to back is very easy for me to do in my garage, while cross rotation is a bit more work. Just looking to get the best mileage on these excellent tires.

 

There is always power to the front wheels. The default is 70% rear, 30% front, with the ability to go 50/50 as traction varies.

 

KISS---Keep it simple stupid. Whichever way you rotate the tires will not extend the life of the tires measurably.