Add ragdoll PVS (allows players to see inside the map if a ragdoll exists within it).

Add weapon ESP (renders only the weapons held by NPCs).

Add r_novis option (disables the PVS system, causing the entire world to be rendered at once. This feature already exists in vanilla, but this option makes it easier to toggle).

Add sv_autocull_enable option (since I use the Automatic Culling - Dynamic auto-cull addon, which is incompatible with the roaming feature, this option allows players to easily enable or disable it).

Note: When using roaming mode, weapons may be culled even if they are not visually blocked by walls or other obstacles. If you move too far away from a weapon, it will be removed from rendering. As a result, unless your camera is close to the NPCs, you’ll see a group of NPCs fighting with invisible weapons.

NPC PVS extend can also be enabled in no-clip mode

Delete “utilities” — unsupported character.

Add a custom PVS distance option

Add a custom PVS distance option

Now players inside the BSP can see NPC combat animations; they’re no longer static.
It just happened by accident, and it actually worked.