I remember seeing this hidden parameter in the past ( and that had an issue when querying v$temp_extent_map view. 
This view returned wrong results if this parameter was set to true.
Now is a different story in 
We started to see many ORA-600 [kkqcscpopnWithMap: 0] errors. 
Turns out is because of the same parameter.
MOS note “Query Errors With ORA-600 [kkqcscpopnWithMap: 0] (Doc ID 2260457.1)" gives a workaround and a patch to be applied.
After applying the patch no more errors in the alert log.

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