I have nothing to back this up with, so it's just guessing.
But maybe it's a system constant?
In the provided A2L:
SYSTEM_CONSTANT "SY_NWGA" "0"
SYSTEM_CONSTANT "SY_NWGA2" "0"
SYSTEM_CONSTANT "SY_NWGE" "1"
SYSTEM_CONSTANT "SY_NWGE2" "2"
SYSTEM_CONSTANT "SY_NWRA" "0"
SYSTEM_CONSTANT "SY_NWRE" "1"
SYSTEM_CONSTANT "SY_NWROI" "1"
SYSTEM_CONSTANT "SY_NWS" "2"
SYSTEM_CONSTANT "SY_NWSA" "0"
SYSTEM_CONSTANT "SY_NWSE" "2"
SYSTEM_CONSTANT "SY_NWSTIM_PRE" "16"
SYSTEM_CONSTANT "SY_NWVAR" "2"
Which looks like everything related to the intake valve adjustment is in there.
However, you could be right. As mentioned, I'm not 100% certain about Porsche bins. :\