Does anyone know what camera settings are changed by the various picture modes on the S4?

Here's what I've managed to deduce by experimenting but it's probably not comprehensive:

Landscape: sets small aperture for max depth of field
Flower: ?
Portrait and Self Portrait: large aperture, +0.3 EV exposure compensation
Surf and Snow: +0.3 EV exposure compensation
Autumn Colours: -0.3 EV exposure compensation
Sunset: -0.3 EV exposure compensation
Night Scene: allows longer shutter speeds maybe?

Most camera reviewers seem to think that digital zoom is of little use and suggest that you might just as well crop the image on your PC.
But is this true?
If I'm shooting at maximum resolution it must be so but if I'm shooting at less than maximum then there should be some scope for the camera to use the 'unused' resolution to zoom digitally without loss of quality.
Does anyone know if digital cameras in general, and the S4 in particular, actually do this?