Comment Form Modification

I’ve been troubleshooting problems with the visual media editor for about a month now. I finally found the problem. Below is the code I have in a plugin in the mu-plugins folder to modify the comments form for all the sites on my multinetwork install.

<?php
/*
Plugin Name:  Comment Form Mod Plugin
Description:  Plugin written to remove Website field and HTML tags field
*/

function remove_extraneous_fields() {
	add_filter('comment_form_defaults','mynetworkmod_comments_form_defaults');
	add_filter('comment_form_default_fields', 'remove_comment_url_field');
}
add_action('after_setup_theme', 'remove_extraneous_fields');
function mynetworkmod_comments_form_defaults($default) {
	unset($default['comment_notes_after']);
	return $default;
}
function remove_comment_url_field($fields) {
	unset($fields['url']);
	return $fields;
}
?>

This plugin works at doing what I want, but it also destroys the ability to crop and rotate photos. Any thoughts?