Won't make a difference. People will find out through guild chat and other methods too.
Like Blueh said, I'd rather not have bug indicators. If a bunch of noobs could pull out a map and find an agrias butterfly that had just spawned above swamp for instance, everyone would rush over and crowd it and start making panic swings on it and drive it into the middle of the ocean. Might as well have baddy and gralat indicators. Don't forget Easter Egg indicators for Easter!
Like the Pyrat Quest idea though.