You got that right Jim, and even then it is incomplete.

I doubt the vendor would ever include a "how to tune" for it would have to be open ended to suit all users type of config of PCM they want.
Also doubt vendor would do it for it would take writing a book and they might feel if people went by the book and then blew engine or had lousy tunes they would blame the vendor.
Tuning a F-body would be different then a C5 due to the C5's functions the F-body does not have like active handling, drive by wire and drivetube issues. plus differences like a F-body having a EGR circuit.

This tune stuff is seat of the pants and how much the end user understand the functions they are changing.