It would be nice to have additional parameters for zombification such as:

for weapons:

ZombificationOnDamage: int (zombification chance will only fire if the target takes at least X damage from the zombifying attack after armor/resistances, not on hit)

ZombificationOnKill: true/false (zombification chance will only fire if the target is normally killed by the zombifying attack)

ZombificationChanceRanged: int (zombification probability for the ranged element of this weapon)

ZombificationChanceMelee: int (zombification probability for the melee element of this weapon)

and for armors, so you have options other than straight up immunity:

ZombificationResistAbsolute: int (reduces the chance of zombification by this flat amount to a minimum of 0; modifies specialChance/ZombificationChanceRanged)

ZombificationResistPercent: int (reduces the chance of zombification by this percent to a minimum of 0; modifies specialChance/ZombificationChanceMelee)