code to fix shit for WPEC gallery

admin.js

function wpsc_update_product_gallery_tab(obj){
	var output;
	output = '<div id="wpsc_product_gallery">';
		output += '<ul>';

		for (var i = 0; i < obj.length; i++){

			output += '<li>';
				output += '<img src="' + obj[i].sizes.thumbnail.url + '">';
				output += '<input type="hidden" name="wpsc-product-gallery-imgs[]" value="' + obj[i].id + '">'; // new item to include hidden field with ID
			output += '</li>';
		}

		output += '</ul>';
		output += '<div class="clear"></div>';
	output += '</div>';

	jQuery('#wpsc_product_gallery').replaceWith(output);
	wpsc_update_product_details_metabox_live_title();
}

display-items-functions.php

<?php
/**
 * We really need to either bake this functionality in for 3.9.0 or rip it out into Gold Cart or something else.
 * So not awesome to have this exposed and unusable.
 *
 * @param  WP_Post $post Product
 * @return void
 */
function wpsc_product_gallery( $post ) {
	$upload_iframe_src = esc_url( get_upload_iframe_src( 'image', $post->ID ) );

	$images = wpsc_get_admin_product_gallery( $post->ID ); // new function call to get images from meta field

	$output = '<div id="wpsc_product_gallery">';
		$output .= '<ul>';
		if ( $images ) {
			foreach ( $images as $image_id ) {
				$output .= '<li>';
					$output .= '<img src="' . wp_get_attachment_thumb_url( absint( $image_id ) ) . '">';
					$output .= '<input type="hidden" name="wpsc-product-gallery-imgs[]" value="' . absint( $image_id ) . '">'; // new item to include hidden field with ID
				$output .= '</li>';
			}
		}
		$output .= '</ul>';
		$output .= '<div class="clear"></div>';
	$output .= '</div>';

	$output .= '<p class="hide-if-no-js">';
		$output .= '<a class="button button-small thickbox" title="' . esc_attr__( 'Manage Product Image Gallery...', 'wpsc' ).'" href="' . $upload_iframe_src . '" id="wpsc-manage-product-gallery">';
			$output .= esc_html__( 'Manage Product Image Gallery...', 'wpsc' );
		$output .= '</a>';
	$output .= '</p>';

	echo $output;
}

wpec-fix-shit.js

//******************************************************************************************
// start the engine
//******************************************************************************************
jQuery(document).ready( function($) {

//******************************************************************************************
// make the image gallery drag / drop / sort
//******************************************************************************************

	$( 'div#wpsc_product_gallery' ).each(function() {

		$( this ).find( 'ul' ).sortable({
			cursor:			'move',
			revert:			300,
		}).disableSelection();

	});

//******************************************************************************************
// we are done here. go home
//******************************************************************************************
});

wpec-fix-shit.php

<?php

/* call my functions */
add_action ( 'save_post', 'wpec_new_gallery_save' );
add_action ( 'admin_enqueue_scripts', 'wpec_new_gallery_script' );


/**
 * [wpec_new_gallery_save description]
 * @param  [type] $post_id [description]
 * @return [type]          [description]
 */
function wpec_new_gallery_save( $post_id ) {

	// make sure we aren't using autosave
	if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE ) {
		return $post_id;
	}

	// run our post type check
	if ( 'wpsc-product' !== get_post_type( $post_id ) ) {
		return $post_id;
	}

	// and make sure the user has the ability to do shit
	if ( ! current_user_can( 'edit_post', $post_id ) ) {
		return $post_id;
	}

	// all clear. get data via $_POST and cast as an array
	if ( ! empty( $_POST['wpsc-product-gallery-imgs'] ) ) {
		$image_ids	= (array) $_POST['wpsc-product-gallery-imgs'];
		update_post_meta( $post_id, '_wpsc_product_gallery', $image_ids );
	} else {
		delete_post_meta( $post_id, '_wpsc_product_gallery' );
	}

}

/**
 * [wpec_new_gallery_script description]
 * @param  [type] $hook [description]
 * @return [type]       [description]
 */
function wpec_new_gallery_script( $hook ) {

	$screen	= get_current_screen();

	// load media on individual items
	if ( is_object( $screen ) && $screen->base == 'post' && $screen->post_type == 'wpsc-product' ) {
		wp_enqueue_script( 'wpec-fix-shit',	plugins_url('js/wpec-fix-shit.js', __FILE__ ),	array( 'jquery', 'jquery-ui-sortable' ), null, true );
	}

}

/**
 * [wpsc_get_admin_product_gallery description]
 * @param  integer $post_id [description]
 * @return [type]           [description]
 */
function wpsc_get_admin_product_gallery( $post_id = 0 ) {

	$meta = get_post_meta( $post_id, '_wpsc_product_gallery', true );

	// no custom gallery was created, so return nothing
	if ( ! $meta ) {
		return;
	}

	// now make sure the IDs present are actual images
	foreach( $meta as $key => $image_id ) {
		if ( get_post_type( $image_id ) !== 'attachment' ) {
			unset( $meta[$key] );
		}
	}

	// send it back
	if ( ! empty( $meta ) ) {
		return $meta;
	}

	// nothing left.
	return;

}

wpec-fix-shit.txt

## notes regarding changes made to WPEC core files ##

#### wpsc-admin/js/admin.js
* line 574: added hidden field to output 

#### wpsc-admin/includes/display-items-functions.php
* line 883: used new wpsc_get_admin_product_gallery function 
* line 891: added hidden field with output

may be worth adding a small amount of CSS for the image hovering and also possibly an ajax call to update the gallery meta when dragging is complete.