Thanks mate. I'm a bit disappointed that I haven't had any replies there (apart from Rob). I think my post was a bit long with too many questions. Might re-post with less questions.
The script is in this thread:
http://pixinsight.com/forum/index.php?topic=3446.0
And just a couple of days ago someone updated it because the original author can't spend much time on it at the moment:
http://pixinsight.com/forum/index.ph...29248#msg29248