Hi, Charles
If you measure and mark accurately, paying attention to use the same technique when marking and aligning. Then it is a very accurate saw. I would say that 1/64" repeatability is no problem. You can make it easier and more repeatable even with out the MFT by using a jig (one was just shown in another thread). Or some type of system for setting the rail. Your goal for getting the most accuracy is to elimenate human error. The saw itself is very accurate.
I like to reduce the human error by using some of the Incra and Woodpeckers measuring/marking tools combined with John Lucas's razor blade alignment idea. The Woodpeckers T Squares have pencil point size holes every 1/16" , and the Incra rules are similar. If you put the pencil in the correct hole it is very hard to be off the mark. Then tap in a razor blade on the mark. Push the guide rail up against the razor blade, and bingo the rail is right were it belongs. It is really easy when using the thin edge of a razor blade to place the rail in the center of the mark or on the left / right edge of the mark. This may sound like a bit of a process but it is actually very fast, and saves time.
Seth