Are there any addons that, like GridStatusRaidDebuff, are specifically designed to notify parent unit frames about *important* raid debuffs? Looking around, most major frames seem to require these debuffs to be entered manually.
Anything of the sort would pretty much need to be a plugin specific to a particular unit frame addon; a generic version wouldn't really make sense since it would need to be much bulkier to support all of the existing unit frame addons, but that bulk would be mostly wasted since nobody runs more than 1-2 unit frame addons at a time. You might have better luck if you mention which unit frame addon(s) you're hoping to get this functionality for.
That said, after using GridStatusRaidDebuff for a while, I found it was actually easier (and less performance impacting) to just add the few debuffs I cared about manually, since most of what it lists are either (a) dispellable by me and therefore already show up automatically, or (b) dispellable by others and therefore don't need to be seen since I don't lead raids, or (c) not dispellable and have no real impact on my gameplay. In the interest of showing only necessary information, there are only a very few debuffs I've manually added; Kel'Thuzad's chains and frost blast are the only two I can think of at the moment.
I agree, but as a heal leader it's usually of utmost importance that I do know what was afflicting raid members, or what caused our last wipe. :P The only auras I had to manually remove from GSRDebuffs was the 4HM stacks and some other useless debuffs that don't really endanger lives.
Anyway, I didn't actually hope to see a one-in-all addon that plugs into multiple raid frames like you describe, but was just wondering if there's a list of individual addons that plug into their parent addons with the same functionality, e.g:
Grid - GridStatusRaidDebuffs
Grid2 - Grid2StatusRaidDebuffs etc. :P