So Brother realized that folks were getting frustrated with all this Mode A/B crap, and in about V8 or V10 of the firmware, we found a new interface for High Accuracy in the control, but turned off. They call it the "Quick Setting" function. I believe that they really intended this to be a feature improvement they were going to really trumpet with the new X2 update that came out in the beginning of the year, but Brother seems to allow software only upgrades to work on previous machines (new rotary fixture offsetting, for example, was for the M200/M300, but also works on the S series machines).
Having said that, while the interface and parameter pages are there and you can turn on the new Quick Setting function, the actual driving parameters are *still blank*. This is frustrating and requires not just turning on the new system, but playing Keyboard Commando for a while and plugging all the numbers into various parameter tables.
When this was a hot topic a year and a half ago, I found that the Parameter Manual actually had values for High Accuracy Mode A and B, though they were not burned into the machine at the factory. They provided a solid set of baselines that we could look at and have a much better understanding of how the system functions. I experimented with those numbers and did some tweaks, then published a PDF to try to walk folks through how this all works.
Yamazen has that PDF and I know Andy's West Coast team basically inputs them in as part of the install process. I don't know how other regional offices have this set up, but all the application engineers should know about it and, at the very least, send owners a copy of that PDF if they ask.