I am not an expert on the auto, however in a few of the tuning threads there has been discussion about when / if one of the tuners would come out with the tools or the option to modify the auto shift points. My recollection is that Westers was at least considering that but I have yet to see posts that state that they or anyone else for that matter has actually cracked the code for the transmission control module.
I suspect you will get some answers to this post over the course of the next couple of days, but I recommend that you contact Dave (Werks) and Doctor Dave (DDM) on the phone and ask them that question. They are well connected within the community and might offer some good information or a suggestion of where to go seeking more data.