Shared NPC initiative

When rolling initiative for NPCs, ensure that the NPCs that are of the same type get the same initiative. This can be toggled off.

Re-roll initiative

Using "Re-roll initiative" will always ignore the shared initiative and generate a new roll.

DnD5e

The DND system natively groups the actors for you visually.

PF1e

As I don't play PF1e, I simply checked if it's compatible and it seems to be (without knowing anything about the system).