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Sound German Automotive is who you're looking for: https://www.soundgermanautomotive.com/

As far as I know, it cannot be done. The Pinion Factor would be the way to do it, but HPtuners does not allow that to be changed for some reason. Hopefully there are still more features to come.
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So the CAN outputs from the PCM to the TCM are the same regardless of transmission (RFE or 8HP or stick shift?) The reverse must also be true. What transmission are you running? I would have thought...

Watching as I have the same question and am not sure of the exact differences.