I don't look at raid warnings either; I set up Grid to show Deadly Poison on the center icon, along with other raid debuffs I need to know about. Also eagerly awaiting Pasta's rewrite of GridStatusRaidDebuff.
Eh, personally I see raid icons as only being useful for situations where you actually need to know where the affected player is. A prime example would be Void Reaver's Orbs; you need to see where the targeted player is so you can get away from where he's standing. Dark Barrage doesn't work this way; you don't need to move away from the person affected. I guess if you heal by clicking on people in the 3D world, it could be useful, but I've never met a healer who didn't use raid frames to target people and heal them.
Nekrataal, there's no need to get all butthurt because your request was declined. Funkydude and the other BigWigs authors are under no obligation to add anything to BigWigs, or even to maintain the addon at all. Indeed, I agree that specialized functions like the one you suggested should be an external module, as they're not relevant to the majority of the raid. Your inability to program in Lua doesn't entitle you to having addons written for you.
I'd like to request the addition of a "dummy" module for Shade of Akama. There's no need for any actual boss alert/warning features during this fight, but it would be helpful to have the BigWigs boss engaged/killed events fired for other addons which depend on BigWigs to tell them I'm fighting a boss.