I have improved all Combine NPCs by assigning them to a squad called overwatch (novaprospekt for Prison Guards), letting the soldiers to throw grenades (Elites shoot AR2 Secondary Fire). Soldiers chat, Hunters and others are together (causing that Hunter will dodge, shoot Magnussons, support Striders, etc), Also Metro-Polices have Manhacks.
I corrected condition to have Zombine in list, now if player doesn't have HL2:EP2 but HL2:EP1, Zombine will be there for him in the list.
Improved Combine NPC AI and other stuff about NPCs
I feel like Manhacks on Metrocops will be quickly annoying.
Also that random comma on npc_stalker entry,
And as far as I know, if you don't have EP2 mounted but have EP1, you will not have textures for Zombines.
Will fix 'em,
but about Zombine, I tried once, Completely remove EP2 and only installed HL2 and EP1, spawned a Zombine with ent_create and npc_create,
No texture missing, fully functioning and sounds were OK.
Removed MetroPolice manhack and Stalker entry comma