In the task_dispatcher screen, it is possible to right-click in any field and set a Lookup Navigation.

However, when we select the "Mass Update" button and then click the pencil icon, we can only add fields to this list.

We would like to have the ability to add a Lookup Navigation to the task.person_id field in the Mass Update popup, because according to support case CS0257267, this feature is currently not feasible.