Custom WordPress Comments

This guy explains how to customize WordPress comments pretty well:

http://devpress.com/blog/using-the-wordpress-comment-form/

 

Disable HTML in Comments

You can try this plugin found on :  http://www.theblog.ca/literal-comments

 

// This will occur when the comment is posted
function plc_comment_post( $incoming_comment ) {

	// convert everything in a comment to display literally
	$incoming_comment['comment_content'] = htmlspecialchars($incoming_comment['comment_content']);

	// the one exception is single quotes, which cannot be #039; because WordPress marks it as spam
	$incoming_comment['comment_content'] = str_replace( "'", ''', $incoming_comment['comment_content'] );

	return( $incoming_comment );
}

// This will occur before a comment is displayed
function plc_comment_display( $comment_to_display ) {

	// Put the single quotes back in
	$comment_to_display = str_replace( ''', "'", $comment_to_display );

	return $comment_to_display;
}

add_filter( 'preprocess_comment', 'plc_comment_post', '', 1);
add_filter( 'comment_text', 'plc_comment_display', '', 1);
add_filter( 'comment_text_rss', 'plc_comment_display', '', 1);
add_filter( 'comment_excerpt', 'plc_comment_display', '', 1);