For Candidate Data Fields, both custom and default, it would be beneficial to organize them in a way that most important items are at the top with a drag of the botton, both custom & default.
i.e. I would be able to put "City" which is a default field and "State (Abbreviation)" Which is a custom field, right next to each other.
That way our recruiters would not have to scroll all the way down to the bottom of the page to enter that key piece of information.