Ok you have the option to change keys, I made quick save G and i can use QS in the game, however it randomly stops working. I hit G saves fine then anywhere from 5 mins to 2 hours into game play it stops working.

"What is life? An illusion, a shadow, a story, And the greatest good is little enough: for all life is a dream, and dreams themselves are only dreams. Pedro Calderon de la Barca"