Hello, "New" X100 owner here with a question about auto ISO, which I have set to my RAW button. I had assumed, the other day while strolling and shooting, that I could use my custom button to toggle between auto ISO and static ISO. However, it seemed to not be the case. Instead, it appeared to just let me choose a static ISO to shoot at if I was not already in Auto ISO. Does this appear to be the experience of others?