1.Shadows on and off apply to part
2.Camera view:Fit to screen
3.Emissive:Brightness
4.Material:Gradient
5.Caustics apply to materials with density,radius,intensity
:)
@1 - what do you mean?
@3 - you can adjust the intensity of the emissive material.
I'll go along with the fit (all objects and selected objects) to screen camera as well.
For the first I assume this to mean turning shadow casting on and off on a per object basis?