@valhallmedia. Thanks for posting and using my module. Well, first, to answer your question… yes, it can definitely be done. Ok, what version of the module are you using? I get the impression from the details of your post that you are using a version earlier than 1.1. If you use version 1.1 of the module, then all you have to do is edit the xml file like you have done, and it will work as expected. Earlier versions require editing the helper.php file. I reworked the code a bit in version 1.1, so it’s working a bit better.
Hope this helps.