You'll need to find out when carputing supports all functions.

C5s - the PCM controlled the engine and trannies
2005 C6 - New PCM and A4 was controlled with a TCM
2006 C6 - Another new PCM and for the new 6-speed auto trannie the TCM is now built inside the trannie !

So carputing might get PCM cracked for the engine but not have the TCM cracked.

As to pig rich, GM has to protect a aluminum engine and CATs so sometimes they add more fuel for that purpose and also to reduce knock that would lower timing and have even less performance. In any case a custom tune gets the performance and still protects the engine if the tuner knows what they are doing and cares about engine life

Yes if owners buy the single user version I then could tune them via email as the transporting flash file back/forth