There were, and are auto indexing attachments available, but I have never used one. I'm right handed, so I simply hook the shell thats in the sizing station with my thumb, and flip it to the priming station. That's all there is to it. Its just as fast, and a lot more dependable than the auto indexing on my Lee Loadmaster.
I have seen mixed reviews on the auto indexers, but if you are going to buy a machine, I would definately look for one with a Hulme Case Feeder. It's a very worthwhile addition, and they are hard to come by if you don't get one with the reloader.