Gravity Perks // GP Unique ID // Use Unique ID as User Registration Password

gp-unique-id-unique-id-as-ur-password.php

<?php
/**
 * Gravity Perks // GP Unique ID // Use Unique ID as User Registration Password
 * http://gravitywiz.com/documentation/gravity-forms-unique-id/
 */
add_filter( 'gform_userregistration_feed_settings_fields', function( $fields, $form ) {

	foreach( $fields['user_settings']['fields'] as &$field ) {
		if( $field['name'] == 'password' ) {
			$field['args']['input_types'][] = 'uid';
		}
	}

	return $fields;
}, 10, 2 );

Hey @g-rzegorz, hit us up via support and we'll be happy to dig in: http://gravitywiz.com/support/