From the spawn Menu look to the right and there should be the panel tab for it.

Allows you to change the following:

Enable Squad Assignment - When enabled the next NPCs spawned will be in a squad. Citizens/Rebels run on differrent squads than Combine/Metropolice. Squads will share information on enemies, cover each other, etc. I recommend no more than 8 NPCs per squad.

Squad Number - Squad that npcs are currently being assigned to.(Up to ten on each side)

Muzzle Effects - Turns off the GDCW muzzle effects (Helps with performance) Some Models have built in muzzle effects but they are not costly on performance.

Enable Combine Grenades - Enables Combine Soldiers that have the Grenade throw animation to use grenades. How many grenades they get is dependant on the class of gun they are using.

Enable Metropolice Manhacks - Lets Metropolice that have the animation for depolying Manhacks, well, deploy manhacks. Default is one manhack per NPC but pistols and shotguns give Metropolice two.

---------------------------------------------------------------------------------------------------------------------
Enhanced Acc. Settings(Serverside)
Made a new accuracy system as the old one wasn't very accurate. To balance the accuracy, damage has been reduced.(Can be changed). NPCs will lose accuracy when running while shooting.

Enable Enhanced Accuracy System - Enables the system(takes effect in real time)

Weapon Proficiency - (0 is poor, 4 is Perfect) Lets you choose how accurate the next NPC spawned will be. The new system accuracy is more dependant on the gun rather than being cookie cut. A LMG on very good proficiency is not the same has a assault rifle with the same.

Damage Level - Scales the damage that the guns will do with the system enabled. (1 is low damage, 5 is High) Changes take effect in real time.