Slack3r,
I'm not exactly sure as to what unit the threshold is in. I would assume the higher the number is, the more stimulus it needs to respond. I think "0" indicates it is turned off, but haven't actually tried it. I was more concerned as to why the light sensor was disabled on a hard reset (or maybe it's disabled on some phones and not others?) Just try different number combinations with the light sensor enabled. The fact that there are two different thresholds, one for generic use and one for turning the screen off, tells me there's other uses for the light sensor. I have no idea what they would be though.
DiceDemon,
Advanced Configuration is the name of an App, located here:
http://www.touchxperience.com/en/adv...tion-tool.html