There is currently no option to customize the Attribute Actions in the Smart Editor widget, while you may extend the widget with the capabilities you need in Web AppBuilder Developer edition.
Attribute rules – are user-defined rules that can be used to automatically populate attributes, restrict invalid edits, and perform quality assurance checks on existing features when they are submitted. Attribute rules are coming to hosted feature services and to forms so that you can execute business logic in your form connected or offline.
Smart forms may provide the capabilities you require moving forward.
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