Monster Spawners & Catacombs Plugin

Alright so I disabled spawn-monsters=false in server.properties
I Did this because with 150+ Players online it starts to generate like 2500 Mobs
Which in turn lags the server severely and drops the tick about %50.

Anyways I was using this plugin catacombs
http://dev.bukkit.org/server-mods/catacombs/
It creates monster spawners in dungeons.

If spawn-monsters=false in server.properties the monsters won't spawn in the dungeons.
Is it possible to allow monsters to spawn just from these monster spawners or just monster spawners?

This plugin seems really cool but it seems to require spawn-monsters=true?
For instance mob arena plugin doesn't require spawn-monsters=true.

Anyways if anyone could give me some help?