I spawn mobs for custom dungeons in a few different worlds but also have a vanilla world. Players can kill mob from spawners but I disable the money rewards for the vanilla world. Currently there isn't a way for both of these settings I have to coexist without disabling/enabling money for the other worlds. By adding the ability to set worlds where money/item drops from mobs spawned via a spawner and disable money/item drops in others would solve this problem I'm having.

I have an idea.

Normally I tag all mobs from MobSpawners with a tag "blocked" but it would be possible for me to remove the IF the mobspawner is in a whitelisted area. And then MobHunting would act exactly as if the killed mob was not from a spawner. Would this work for you?

It is easy for me to make a snapshot so you can test this idea?

So looked at my code and saw that you are already able to whitelist and area where you want the players to get rewards from Mob Spawners. Try whitelisting the area.

In next release you can disable grinding detection in different worlds. Check disable-grinding-detection-in-worlds" I hope this helps you.