No known incompatible mods found yet, and no mod has been given explicit compatibility either.

If you find incompatible mods, please open a GitHub issue so they can be added here.

'How configurable each feature is' - the measure
☔ if on/off values,
☔☔ if editable lists/numerical values, 
and ☔☔☔ if on/off with editable lists/numerical values)
Or simply, more umbrellas more configuration potential

• Zombies can break blocks (☔☔☔)
• Additional zombie drops (☔☔☔)
• Entity multiplier (☔☔☔)
• Entity blocklist (☔☔)
• Daylight resistance (☔☔)
• Heavily armored zombies (☔)
• Day counter (☔)

The config file is present at your_minecraft_game_dir/config/zac-common.toml

your_minecraft_game_dir is the same directory where your mods folder is present

blockMinimumHardness and blockMaximumHardness

The most confusing part (which I assume) are blockMinimumHardness and blockMaximumHardness

You would only need to increase/decrease blockMaximumHardness as zombies not being able to break blocks such as dirt but be able to break blocks like obsidian is not what you usually want.

Check this minecraft.wiki page out for block hardness measures which you can reference here

Entities and items with a minecraft: prefix

minecraft:entity or minecraft:item refers to something already present in Minecraft, same names are used as they are in /summon minecraft:entity or /give @a minecraft:item, like for example when using /give @s minecraft:diamond 20

Mod namespaces should work too but have not been tested

mod_namespace:entity or mod_namespace:item

Additional zombie drops

= is used as a separator here, so:

minecraft:carrot=0.1

Here, minecraft:carrot is the item and 0.1 is the percentage, they are separated by =

So basically, they are item=chance

If you want, say, a gold ingot to have a 25% chance of dropping, we do 25/100 and get 0.25

So that would be minecraft:gold_ingot=0.25

! ! ! This does not not change the default zombie drops, it only adds a chance to drop extra items.