I think broadcast can only be for all and for yourself...
Target flags: - bc_all: Broadcast message is sent server-wide (default). - bc_map: Message is sent to everyone in the same map as the source of the broadcast (see below). - bc_area: Message is sent to players in the vicinity of the source. - bc_self: Message is sent only to current player.
I see, I don't know how too if its possible. My broadcast npc script is using announce. Something like toggling .announce,0; (for disabling) or .announce,1; (enabling to receive announce from broadcast npc)