How to execute conditional script when on new customize.php (Theme Customize) screen

Question

The new "Customize" theme screen is a welcome addition in WordPress 3.4, however, I find it conflicts with my method of loading scripts loaded in the footer:

In functions.php

if(!is_admin())
{
/* GET PUBLIC FUNCTIONS
*************************************************************/
require_once(TEMPLATEPATH . '/functions_public.php');
}

In functions_public.php

/* Move scripts to the footer, speeding up page loading time as per http://yhoo.it/IAL94Z
*************************************************************************/
if ( isset($_GET['page']) && $_GET['page'] == 'customize.php') echo "in customize.php"; else echo "NOT in customize.php";

if(!get_option('my_scripts_head')){
    remove_action('wp_head', 'wp_print_scripts');
    remove_action('wp_head', 'wp_print_head_scripts', 9);
    remove_action('wp_head', 'wp_enqueue_scripts', 1);
    add_action('wp_footer', 'wp_print_scripts', 5);
    add_action('wp_footer', 'wp_enqueue_scripts', 5);
    add_action('wp_footer', 'wp_print_head_scripts', 5);
}

This code branch moves those scripts from wp_head to wp_footer. When this option (my_scripts_head) is enabled, the "Customize" screen shows my theme preview without the scripts that are loaded in the footer.

I find that when I disable this option, the "Customize" screen loads fine, including my scripts.

When themes are previewed in customize.php, does wp_footer not fire?