I have to disagree with you here. Wikipedia is famous
as the
Encyclopedia "anyone can edit". If a random anon sees a page and tries
to edit it, and cannot (while the main page still proclaims how
everyone can edit), they are going to be dreadfully confused- lord
knows enough are confused by the basic idea without adding on a second
level of possible confusion. Perhaps two templates: the scary one for
temporary semiprotection, and another, more discreet one for the more
permanent ones?
Given how many web sites require registration these days, I don't feel
there's a conflict between saying "anyone can edit" but you have to be
registered to edit to certain articles. It's not like we're saying that
only certain registered can edit, we would just be saying to you have to
register to edit.
Sue Anne