I have a square setup RWD, non directional Perelli P7 Cinturano all season Plus tires.

The manual states tire rotation back to front on same side only.

Where the stock tires directional?
I don't see why I can't cross the front tires and put them on the back, move the back tires strait to the front.

 

You can do method A or B. Discount Tire (for example) and other tire dealers usually prefer one method over the other.

 

I do A, I used to too but still do

 

Many performance tires are directional, so you can only swap front to back.

Yours P7Cs are not directional, so you can cross them.