The camera app could be improved in many ways, here's a couple to get started, please add your own suggestions.
1. Either allow us to specify a default camera mode OR start the app in the last mode used. It's silly that we have to select Pro mode every time we launch the camera.
2. In Pro mode allow us to select Auto ISO with a specific shutter speed or vice versa. At the moment, setting either shutter speed or ISO to auto also sets the other setting to auto. This means that if I choose a fast shutter speed I have to manually dial-in the right ISO to get a correct exposure. The app should do this for me.