1.) if the software started to work than you can set back $LOGIN_SCREEN_ENABLE = true; to enable the login screen, that should work now.
*I would leave the .htaccess file and set the $WEB_SERVICE_URL = "http://www…..com/chat/functions.php"; - WITH WWW!)
2.) I am not familiar with the old RVC and maps API but I am sure there must be a workaround. I would disable maps in the .swf