looking for an addon ->

[lmryll]

When I get a LFD pop and WoW is in the background, the taskbar will flash.

I have sound enabled in the background but I'd like to watch a movie or listen to music instead while waiting.

[Deleted]

Unfortunately you can't have an addon that does something outside the game.
There are some addons that can make sounds even if you turned off everything else, like this http://www.curse.com/addons/wow/dungeonready

[Nynax]

I dont think what you are asking for CAN be a thing. You want an "addon" that reads an event happening in wow, and then goes into the Windows framework to cause an effect to the OS UI.

That's not an addon, that's a third party program. I supppose someone might be able to write one, but it might even go against Blizzard TOS. being an external program.