Yeah there is nothing similar between the vette's A6 and a plain vanilla 4spd at all. I really cant do anything with that file except open it, nod and smile knowing that it works for you.
The tow rating thing is stupid. If ANYTHING, GM should have made this 4th unlock crap only active in the Performace Mode, whenever that is clicked on.
Either way, when it all boils down to the nuts and bolts (or ones and zeros, rather) If (and it probably is) it is PCM related, it can be changed. Just a matter of getting our peeps to let us have access to it.