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

General Settings

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 Muzzle effects (Helps with 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.

BMS NPC Weapon Settings:

Enable Ammo Drop - Toggles whether or not npcs will randomly drop ammo.

M203 Grenade Launcher Usage - Toggles whether or not Npcs will occasionally fire m203 grenades from the MP5 or M4

GDCW Muzzle Effects Override - Allows you to override the BMS muzzle effects to GDCW muzzle effects.

NPC Gun Drop - Toggles whether or not NPCs will drop player usable SWEPs.

Patrol on Spawn - Toggles whether or not npcs will patrol the area when first spawned in.