The exposure adjustment dial on the P4 remote controller seems to default to adjust the shutter speed, which is where I want it to be. However, on a couple of occasions, when I moved the dial, it changed the ISO setting, which I most definitely did not want. Why did it change what exposure parameter it was adjusting? Additionally, is there an easy way to designate what that dial is going to adjust? Like I said, I always want it set to adjust shutter speed. Thanks.