How to change form encoding to application/x-www-form-urlencoded

Your software
My Mautic version is: 2.15.3
My PHP version is: PHP 7.2.24-1+ubuntu16.04.1+deb.sury.org+1
My nginx version is: nginx/1.16.1

Your problem
I want to change the default form encoding type from multipart/form-data to application/x-www-form-urlencoded to test a no CAPTCHA required anti-spam lua script that doesn’t support the former.

Any suggestions?

I think I need to change the default form type, or possibly expose a custom option.

Virgil