Define what kind of users we will play with...

pov-config-users-roles.php

<?php
//paste this code somewhere in your project config....

//define what kind of users we will play with...
Boot::$events->addEventListener(EVENT_BUILD_MODEL,function($recordType){
    if($recordType=="R_user"){
        R_user::$roleAdminTextOnlyEnabled=false;
        R_user::$roleSimpleHumanEnabled=false;
        R_user::$roleWriterEnabled=false;
    }
});