[otrs] How? Show 'create_time' from customer_user table in admin interface?

Hello. How to show in the 'Customer' in admin interface, the 'create_time' field from customer_user table? I know that adding that field in 'Map' in Config.pm creates a 'Column...specified twice' error when trying to create a new account, even though it appears to work since that field does show up in that interface. Is there another way to do it without hardcoding it in the dtl file? It would be nice to see when a customer's account was created when in the admin interface instead of having to look in the database. Not sure if this feature is in the latest version. Thanks.