Is there a way to remove flinching for certain zombies? My friends and I are at the point where we have guns and zombies really can't do anything when they are stun locked from 100 to 0 by ranged weapons.
I don't know for certain but look at the Entityclasses and see about removing the critical hits? Totally guessing here, but I think that's what drives the animations.
Either way, if it is doable, it will be in that XML.
If you mean the critical hits that SMG and MP5 cause, it's not that. Those only have a 10% chance to work. I mean the general flinching that happens when you attack zombies. Melee weapons do it too.