It is a wasting of time to select linked record in a field one by one.
For example if I want to pick attendance from a table of students I have to click ADD in the form and I can only select ONE linked record and then click again (!) ADD and select the second student, etc.
Please let select more record (with checkboxes near the record, or with selection color, etc.) AND THEN click on a button (โDONEโ).