E posso mas não tenho certeza se da certo vai depender da versão que tu baixou e sem bug visivel na leitura dos arquivos.
Primeiro Abra o zombie_plague_advance.ini e procure por:
[Knockback Power for Weapons] (use -1.0 to disable knockback power for the weapon)
E em baixo tu coloca tudo em -1.0 para desativar como no exemplo abaixo:
P228 = -1.0
SCOUT = -1.0
XM1014 = -1.0
MAC10 = -1.0
AUG = -1.0
ELITE = -1.0
FIVESEVEN = -1.0
UMP45 = -1.0
SG550 = -1.0
GALIL = -1.0
FAMAS = -1.0
USP = -1.0
GLOCK18 = -1.0
AWP = -1.0
MP5NAVY = -1.0
M249 = -1.0
M3 = -1.0
M4A1 = -1.0
TMP = -1.0
G3SG1 = -1.0
DEAGLE = -1.0
SG552 = -1.0
AK47 = -1.0
P90 = -1.0
Se mesmo assim não der certo abra o zombie_plague_advance.cfg e procure por:
// Knockback
// ---------
zp_knockback 0 // Enable weapon knockback (note: pain shock free increases knockback effect)
zp_knockback_damage 1 // Use damage on knockback calculation
zp_knockback_power 1 // Use weapon power on knockback calculation
zp_knockback_zvel 0 // Should knockback affect vertical velocity
zp_knockback_ducking 0.25 // Knockback multiplier for crouched zombies [0-knockback disabled when ducking]
zp_knockback_distance 500 // Max distance for knockback to take effect
zp_knockback_nemesis 0 // Nemesis knockback multiplier [0-disable knockback for nemesis]
zp_knockback_assassin 0 // Assassin knockback multiplier [0-disable knockback for assassin]
E mude tudo para 0 como no exemplo abaixo:
// Knockback
// ---------
zp_knockback 0 // Enable weapon knockback (note: pain shock free increases knockback effect)
zp_knockback_damage 0 // Use damage on knockback calculation
zp_knockback_power 0 // Use weapon power on knockback calculation
zp_knockback_zvel 0 // Should knockback affect vertical velocity
zp_knockback_ducking 0 // Knockback multiplier for crouched zombies [0-knockback disabled when ducking]
zp_knockback_distance 0 // Max distance for knockback to take effect
zp_knockback_nemesis 0 // Nemesis knockback multiplier [0-disable knockback for nemesis]
zp_knockback_assassin 0 // Assassin knockback multiplier [0-disable knockback for assassin]
Espero Ter Ajudado !!!!!