please accept my apology for abandoning this addon and not answering your support requests.
I don't play wow anymore and thus any request will remain unaswered.
Shows a screen flash effect when the LFG system found you a dungeon to enter. This is useful when you play in windowed mode and have your web-browser or something covering most of your WoW-window: you wouldn't see the dialog pop up but the screen flash is quite recognizable.
I modified your mod a little: longer flash duration and listening to UPDATE_BATTLEFIELD_STATUS event for BGs.
Edit: looks like this event does not target Enter BG's event only, but a lot of others too. I still have to find the perfect one, but I'm having a hard time since there is no up to date list of them.