Is it possible to move a custom field to a section other than the "Custom" section?
At this time it is not possible to move custom fields to other areas of the page.
We are, however, working on a new style of page which will allow drag and drop fields to allow field placement options. This functionality will be a user preference as opposed to a system preference, however it will allow users to lay out their fields in a manner which more effectively suites their work habits.