This Plugin allows setting a modifier float for any L4D / L4D2 Weapon Class.
It differs between 'any' victims and Tanks (because Valve decided to split damage calculations).
Damage Inflicted on Players, the Witch, and Common Infected will be changed by that value, within certain limits.
Ive added a convar to allow or disallow modifying melee damage on Commons, just because Valve does damage calculation different on them AGAIN.
For example: If you set melee damage multiplier to 0.5, Zombies will rather randomly die from one to five melee strikes. While that does add to the game in a twisted fashion its disabled by default.
Values below 1.0 (100% damage) are allowed. Zero is allowed and works, with exceptions listed below.