This feature is often needed. For instance we would now like to ask for a list of people living in the same household. For each person, the respondent would give us age, gender, employment status, and his or her relationship with that person. Ideally it should be possible to configure each column to be of a certain type. But in this specific case even a dropdown menu for each would suffice. So the simplest would be either to change the dual scale type to allow for more than two scales or create a new Array (dropdown) question type.