There is command to disable animals and ambient but this only work for custom mission in editor, not for the MP.

Sorry but I don't understand.
I should create a file with parameters you have entered or what? Cause i can find cfgWorlds only in Arma3Tools folder and there is no line: maxCost.

EDIT: Ok, I know what you mean now - config viewer. So, I should create a txt file with what values? Then convert to .bin and pack to PBO and place into the main game folder right? Will this work with multiplayer?

I read that this is some cost on performance, when I was searching for a solution to my problem. Most of the people got snakes or spiders fobia - but we have only snakes ingame. So like I mentioned earlier - this shouldn't be a big deal for devs.