I think something like Magnum Torch that would suppress miniboss/invader spawn in a certain radius is not a bad idea. Because there are too many minibosses spawning around when you just sitting at home. Home is supposed to be a peaceful safezone.

You could use an actual magnum torch, invader spawns trigger off of normal mob spawns, so preventing those will prevent invader spawns.

I may look into reducing invader spawn rates to zero in World Tier: Haven, so players looking to idle can switch down to Haven temporarily.