Interaction of Spells w/ Metamagic

[areteas]

Trying to implement the Tenebrous Spell metamagic feat from Inner Sea Magic, and having a hell of a time figuring out how to handle the spell level adjustment for Illusion (Shadow), Shadow and Darkness spells.

The feat normally adds +1 to the level of the spell selected, but for spells with the sSubschool.Shadow, sDescript.Shadow or sDescript.Darkness tags it should be a +0 adjustment (so either adjust the value of field mmLevel on the metamagic thing by -1 or the spell's level by the same, I guess).

I've looked over Custom Spell's eval scripts but these seem mostly concerned with the gizmo used to select base spells to apply metamagic feats to. The Arcane sorcerer bloodline doesn't seem to actually address this programatically. Anyone ever tinker with this sort of thing, have any pointers?

[chava]

You could cheat ~ make it two different metamagics (getting both from the one feat, or one feat automatically bootstraping the other onto the charaacter) one for most spells and one for shadow/illusion spells.

But that is a work around.