I found the answer to my last trouble with the pull down menu not working everywhere. In fact you have to copy the file "jscript_addr_pulldowns.php" created in "/includes/modules/pages/create_account/" to 3 other folders:
../includes/modules/pages/checkout_payment_address/
../includes/modules/pages/login/
../includes/modules/pages/popup_shipping_estimator/
Then all pull down menu will work.
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