thanks...
well, i was looking for this point of view:
you have 10, 100, 500, or 3000 domains on your server = how can you "see or find out" which sites have errors in a fast, easy, simple way?
what I like about the real-time log viewer, you can set it to Errors only and instantly see if any errors occur.
I think that is pretty cool and nice feature to have! In a couple clicks you can SEE it easily.
So i think that is very useful.
Even more useful is could be done at server level. If it technically, can't be done -- that's another story.