I currently have the dial functions on my pen-f set to ISO for the rear dial and F number for the top/front dial. When I'm in A mode if I turn the rear dial it changes the ISO (awesome) but when I move the front dial immediately after moving the rear dial it also changes the ISO. In order for the front dial to change the aperture again I need to press the shutter button to focus and then I can change aperture with the front dial. Basically it's impossible to change ISO and aperture at the same time. However, when I'm in any of the custom modes the rear dial and front dial can both be used at the same time to change ISO and aperture. This is what I'd like to have happen in A mode. Is there a setting that I can change to make this happen?