I need further information about how visiblefire works.

I can't detect any difference between values of visiblefire of 0.5 and 10.0. AI pretty much has ESP if you fire within their line of sight, regardless what value of visiblefire is set for your ammo. But if I set it to 0.1, then it breaks the AI's ability to "see" you fire at all. Is the valid range really somewhere between 0.1 and 0.5?

Also, what exactly is the relation between visiblefire, visiblefiretime, sensitivity, spotting distance, and spotting time?