Aggressive Mob Control

Was wondering If it is possible to make a plugin to change how frequently Zombies, Skeletons, Spiders, Creepers, Etc spawn in the world when enabled.
Reason: I want to have a lite survival aspect to my Pixelmon server but for the average player on my server the current spawn rates are way to high for vanilla mobs. (Also if there is an easy way to do this and I’m overlooking it the quick help would be appreciated.)
Thanks in advance!