In the Text Field, if there could be an option for auto scalable type, which would automatically scale while writing in a interactive PDF. This would allow the writer to write without exceeding the set text field, which could later be printed instead of hidden when printed, when the scrollable option is selected. The current options are set, scrollable or set font size. It would create a more dynamic set text field.
Also a prompt description in the text field which disappears when writing.