This seems to be a feature in "Brand C"'s product
that sets the maximum amount of timing that can
be pulled out by spark retard functions (the lowest
"pull-to" spark advance). I don't see an equivalent
tab in the VCM_Editor. This would be useful especially
in trying to make a Torque Management setup that
protected the trans, but was not allowed to pull the
spark so grossly.
Or maybe it's just "hiding under an assumed name"?