Okay, so I rather easily managed to find that version of tsMuxeR in the end, I was having coicidental connection problems earlier.
For anyone seeking it in the future:
http://instantitunes.wordpress.com/2010/02/26/use-tsmuxer-on-snow-leopard/
There are couple of things you might have to do if you experience problems. These are detailed in the readme and discussed further in the comments.
Now, it's finally time to stick it to Lucas with the 'Despecialized' Star Wars edits.