From a student...
>>
>> Layer Visibility -
>> The option to be able to turn off the eyeball icon on the layer and have it disappear with out having to alter your opacity or delete the container. great for when working with tons of layers and just want to work on an individual one with out the clutter of the other layers.
my response,"though it could be handy to have i agree, it could also be dangerous. another idea would be to choose visibility PER camera."