Set all fields required via functions.php

I am working on a form with 100+ fields, which is seperated in multiple pages.
In order to be able to test the form more fast i set NO field required.

If i want to set all fields required before release, I want to be able to do that via the functions.php.

Here is an Example, based on this

add_filter("gform_pre_render", "set_required");
add_filter("gform_validation", "check_required");

function set_required($form){
    foreach($form["fields"] as &$field){
     if ($field["type"] != "html")
    {
        $field["isRequired"] = true;}
}
    return $form;
}

function check_required($validation_result){
    foreach($validation_result["form"]["fields"] as &$field){
     if ($field["type"] != "html")
      {

        if(GFFormDisplay::is_empty($field, $validation_result["form"]["id"])){
            $field["failed_validation"] = true;
            $field["validation_message"] = "This field is required.";
            $validation_result["is_valid"] = false;
        }
      }
    }
    return $validation_result;}

The problem: it also sets my html fields to required, even that is not supposed to happen?
See isRequired

Rather than messing around with that, check out this cool tutorial for faster multi-page form testing:

http://gravitywiz.com/2012/05/04/pro-tip-skip-pages-on-multi-page-forms/