If you want some inside baseball, the way it works is you buy flashing tools and a DAMOS (directory of tables and addresses) from a special company, like Dimsport, and then you start adjusting things in the tables to figure out what effect it has on the tuning, and develop a working tune. There are 100s of tuner shops that do that sort of work. Eventually some larger shops like Cobb, HP Tuners, APR, MHD, etc, etc, package all that up in easy to use at home flashing tools and volume sell it.
For now it's all lower volume tuning small shops like Tork and whoever that is doing it. So you'd have to work with one of those guys. With these early stages of flash tuning I don't get BMS involved normally because it's simply not profitable for us. But I often work with flash tuners (we share mutually beneficial data on the back end) for the common goal of happy customers running fast times at the tracks and rolling races for marketing.

Normally we hope they suggest the JB4 as a logging and fine tuning tool for use with their flash maps, and they always want access to our substantial JB4 customer base to purchase their flashing tools. For those platforms that support it we also publish free tuned maps that we've developed specifically for use with the JB4 so customers can then modify them directly or hire personal tuners to further customize their tuning.