I'm looking for an addon like the old decursive, where I can configure BoP to light up when some predefined party/raid members take aggro. Like a window which is empty until the members i choose takes the aggro. Is this addon already out there? If not, then it will be a request of mine. :)
EDIT. While looking at it, this might be bad formulated, but I hope you get my point!
I don't know of a mod that has a separate frame like that however most party/unit frames can highlight who has agro. eg: sRaidFrames puts a red border around whoever has agro, AGUF with the banzai addon changes the health bar to red to indicate they have agro.