Index: wp-admin/includes/media.php
===================================================================
--- wp-admin/includes/media.php	(revision 7538)
+++ wp-admin/includes/media.php	(working copy)
@@ -764,9 +764,9 @@
 
 	$flash_action_url = get_option('siteurl') . "/wp-admin/async-upload.php";
 
+	$flash = apply_filters('flash_uploader', true);
 	// If Mac and mod_security, no Flash. :(
-	$flash = true;
-	if ( false !== strpos(strtolower($_SERVER['HTTP_USER_AGENT']), 'mac') && apache_mod_loaded('mod_security') )
+	if ( $flash && false !== strpos(strtolower($_SERVER['HTTP_USER_AGENT']), 'mac') && apache_mod_loaded('mod_security') )
 		$flash = false;
 
 	$post_id = intval($_REQUEST['post_id']);