Hmm… I see the predicament, as it appears the plugin you’re using uses the comments database for the guestbook.
Well, for removing comments on posts, you can go through your theme files and search for “comments_template()” and remove unwanted instances where that method is called (I’m guessing single.php and page.php). That way, your theme won’t display comments normally.
For comment redirection (I’m guessing you’re talking about including a “Sign My Guestbook” box on each post without including the whole guestbook?), I’m afraid I’m not sure of any straightforward solution. It’s probably solvable by hacking the plugin and theme, but there doesn’t appear to be a quick fix I can discover from a cursory look at the issue.
I hope this helps!
