You can now add a person or a group from the People and Groups pages, without sending anything from your app. A person takes an id, an optional name and email, an audience type, a group and traits. A group takes an id, a name, a type (customer account or department) and traits. The same plan limits and checks apply as for the API, and a duplicate id shows a link to the existing record.
A person's group can be changed from their page, and the Add people action on a group page links several people at once. A customer goes with a customer account and an employee with a department, so the pickers only offer groups of the matching type.
Adding a person does not send them a survey.