I couldn’t get it to work through the plug-in’s admin interface, but the code itself is pretty simple to set up if users are authenticated via WordPress and are logged in (which I require on the site I am using this on):
In the google-analyticator.php file of this plugin, add the following two lines after line 1183, immediately before the line containing ga('send', 'pageview');
<?php $user_id = get_current_user_id(); ?>
ga('set', 'userId', '<?php echo $user_id; ?>');
The first line simply gets the WordPress user ID and the second one inserts it into the GA tracking code as the UserID variable.
Of course editing the core plug-in file is a bad idea… but this will work until the plugin supports GA User ID tracking.
Yes. I would like to see the GA User-ID supported. When do you think this will be included?