[Moin-user] Prevent anonymous deletion of comments

[Gnarlodious]

I have acquired a persistent vandal who deletes comments anonymously,
because the red 'X' is offered to non-logged-in users. This is an
older Moin version 1.5.8 and I don't really feel like updating yet.
What is the easiest way to block anonymous users from deleting
comments? Will an ACL on the page containing the comment field allow
comments to be writen but not deleted?

-- Gnarlie