Defiant Gear in Global Loot

[Fridgecritter]

I see this table in the database and I'm wondering what the extra fields are for in the pinked out area on the right. Can anyone tell me what you'd use those for? Class balancing? If casters aren't getting a fair shake, you enable defiant for casters only in there?

Also, does that mean you can make defiant drop only in certain zones, like ToV or Kael? I think everyone agrees Defiant armor is OP for new players, but if it could be enabled for certain harder zones only, with a single entry into the database, that's cool!