Thats pretty much the point of it, isn't it? If you got shadows uglyfining you, for lets say screenshost and so on, get rid of em, take your pic, turn the local lighning on again *nodnod*
The vast Majority of People here dont have a Pc that can handle ultra settings, you so can doge them. i might upload somthing with ultra settings and the light settings from this notcard to clearify what the uses are,later.
Highest settings - depth of field
Normal settings - most people will have this by standart.
Notacard Settings
sorry for the long post, i hope i could carify what i wantet to say, should have postet pictures of the setting firsthand anyways, sorry for that also.