gravityforms/includes/fields/class-gf-field-radio.php has:
if ( $is_form_editor && $count >= 5 ) {
$editor_limited = true;
break;
}
changed into:
$gf_radio_field_editor_choice_limit = apply_filters( 'gf_radio_field_editor_choice_limit', 5); // Default to 5 being the limit but allow a different value to be specified via filter