There are 4 shortcuts in Galaxy S3 camera interface. These default shortcuts are Shooting mode, Flash, Effects, and activate second camera. Modify or edit camera shortcuts and change them to your favorite shortcuts, by doing as follows:
1. Open Camera app and go to camera settings by tapping the Gear Icon on the top menu
2. Tap Edit Shortcuts
3. Now, tap and hold icon, then drag it to edit position of shortcuts.
Available shortcuts are: Scene mode, Exposure value, Focus mode, Timer, Resolution, White balance, ISO, Metering, Auto contrast, Outdoor visibility, and Guidelines