Plugin Help Increased mob spawn region

Is it possible to create a region with worldguard/worldedit or something similar than that to increase the mob spawning for certain areas?

Let's say i would like to have this path flooded with zombies, creepers and so on and make it that the monsters still can spawn outside of this hallway. It should be harder to get thru there, maybe even customize the monsters so they are stronger?

I tried to play with worldedit and worldguard, even googled and found nothing :/

here's a screnshot of what i ment, the dark spaces flooded with monsters and a little bit of monsters in the lighted parts... I know normal minecraft doesnt allow that but is it even possible to make lights ignore the spawn thingy so they can even spawn in a bright spot?




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