I dont know if it would work and i know the tank wont act as he does in L4D but…
I got an idea that might work im no genius in lua coding so im just requesting this.
What if you Got These Ragdolls:
And you gave them Actions of the hl2 zombies or even monsters?
L4d Zombie Action Replacements:
Witch=Fast Zombie Actions
Regular Zombie=Fast Zombie
Boomer= Poison zombie
Smoker=Antlion i guess…
Hunter=This wouldnt work unless you probly got a fast zombie action and gave it the same action as a barnacle so when the tongue hits em it sucks em in. i doubt that would work though.
Pretty much what im saying is Replace Those NPC’s From Half life 2 With Left 4 Dead Models and i dont know if it would work, im no genius in all that coding crap so dont flame me if im wrong.