I don't think that much damage can be done
that way as actions would be taken very quickly
and readers would know the facts...

It's not realy a problem to change the forum
so that people would have to sign-up but I think
it would be too annoying especialy for new
comers. (naturaly, could do something were
signing-up is needed only to post).

Cheers,
Yann Stettler