In reply to Toerag:
Nooooo!
E0 only exists for people who can't accept that they only lead HVS, and for tiresome troll arguments about "That Route". Adding it as an actual grade would open all high end HVS to the same treatment and would cause the UKC rocktalk forum to irrevocably slide into the pit of madness.
This would force the UKC staff to waste time digging a bigger madness pit. The Pub and Off Belay already have it overflowing as it is.