Heh, perhaps I was a little confusing with my original post.
I was only intending the change to be used in corpse summoning areas that permit the use of /cm callcorpses already. It's true what prompted this thread was an incident in generals. I don't actually know if there are any other places in the game where multiple raids may congregate in a zone containing a corpse summoning area, I just assumed there were, or would be at some point.
Going over it in my mind, to achieve the desired effect, the default setting would need to be changed to raid-only while the 'all corpses' setting would need a specific tailing attribute, as people wouldn't know to use the raid suffix and end up summoning all corpses again.
Maybe it's not worth the effort, I honestly don't know what is involved, and if it's only one zone that it will ever affect, then maybe we'll just have to deal.