Is there a way to make an NPC say dialogue while using a lesser/greater power?

[Mud]

As the title asks, does anyone know how to make an NPC speak as they use a power? I see entries for VoicePowerStart and VoicePowerEnd in the Combat dialogue tab, but those sound like they're just for dragon shouts. On a similar, probably more important note, do NPCs know to utilize powers they have in their arsenal by default, or do they never use them under default AI?