It would be useful in the PHP gravity_form function (and corresponding short code) to be able to pass a string value of $display_title, which would result in that string being shown in .gform_title rather than the form’s true title.
gravity_form( $id_or_title, $display_title = true, $display_description = true, $display_inactive = false, $field_values = null, $ajax = false, $tabindex, $echo = true );