You can set the max ISO in auto mode in the settings. https://helpguide.sony.net/ilc/1930/v1/en/contents/TP0002727476.html

No. When you are in full auto the camera has control. That's why it's important to learn how to use the camera. 

I'm new to the A7C II so I'm not clear if this is normal behaviour or not. I have the camera set in continuous bracketing mode, set to 0.7EV and 3 shots. If I long press the shutter, I get 3 images as expected. If I short press it, I get 2? Why is this? Am I missing something obvious here - I couldn't see it documented. Is there a way to get the expected number of shots while short pressing the shutter? Many thanks.