LordJord

I'm looking for advice on how to go about removing an entity (for example Rabbits) from the game entirely without having them be replaced by some other entity. The reason I need to achieve this is to make the game playable for my girlfriend who has a phobia of zombies. I know that zombies can be disabled in game however I would still like there to be an element of challenge. Currently I have edited entitygroups.xml to replace all zombies with rabbits. While this is playable with mods adding survivors and bandits it's a little weird to have rabbits all over the POI's... Is there a way I can just remove the zombies for good yet still allow modded enemies to spawn?