Option to disable optical zoom and to do only digital zoom

[hgkamath]

Some phones may not do optical zoom
Some phones may crash if optical zoom is attempted due to non-support/buggy driver etc.
Some people may not like digital zoom

a) provide a setting in the setting widgets to disable optical zoom/digital zoom/both
b) detect if optical zoom is present, and if not disable the feature
c) let the pinch-to-zoom feature be appropriately restricted to the zoom range or made to not be available if both optical and digital zooms are disabled

LG Optimus G E970 crashes with certainty with kernel panic when attempt to zoom. A mechanical sound of some sort can be heard as it attempts to do something.