Warden drops and light level 0 mob spawning

I like how the light level is 0 for mobs to spawn but I also feel like it doesn’t seem right, an idea I have is possibly certain biomes could have a separate mob cap under the main one so you don’t walk into a drop stone cave and get bombarded by millions of skeletons etc. also an idea I have to have mood lighting more available to survival without a ton of mob spawns is have the warden drop have some item that could be crafted into something like a “skulk rod” that could prevent mob spawning within 20 blocks and if any mob wanders 15 or more blocks into the range they would run away, like creepers and cats but it would be for all hostile mobs. (Minus the warden) thanks for considering :)