Appends each CRM field's internal ID to the field label in the dropdowns.

wpf-add-field-keys-to-names.php

<?php

function add_field_keys_to_names( $fields ) {

	foreach ( $fields as $i => $category ) {

		foreach ( $category as $key => $label ) {
			$fields[ $i ][ $key ] = $label .= ' (' . $key . ')';
		}
	}

	return $fields;

}

add_filter( 'wpf_get_setting_crm_fields', 'add_field_keys_to_names' );