What I would like to suggest is mentioned on this thread in the forums:
http://wordpress.org/support/topic/turn-page-comments-off-by-default-311
What we would like is a blog settings option that allows the admin to set whether pages and/or posts have COMMENTS ON or COMMENTS OFF by default. At the moment it defaults to COMMENTS ON, which is often not convenient especially for Pages on which many site admins do not want people leaving comments.
I imagine it is very simple to implement.