Absolutely and I see what you are saying so don’t get me wrong there.
From what I have read the ZF DSG in the longitudinal applications is rated to ~440lb-ft of torque. The transverse DSG was about 260lb-ft. (there is a new transverse unit for the TT-RS) The big rumor surrounding the original DSG was that the transmission would blow up at those levels (aka with a chip alone) but nothing has happened. I think the torque curve is more important than the actual numbers alone. The 2.0T you are referring to in your A4 is also different and has more torque than the longitudinal setup found in the A5/6 chassis (a3/tt/mk5)
With all that said, 500wtq has been done and he’s not the only one…
http://www.youtube.com/watch?v=st0GGf8kc4M
Obviously there is a breaking point, I just don’t think its as low as some are speculating and when that’s reached someone will upgrade the clutch packs! (and that will probably be when there are a lot more options and tuners in the game) Seemingly the worst that has happened is the clutch packs starting to slip and cases of the unit overheating but audi has already aided in the reduction of that problem by having two different oil circuits
And a 7 minute overview of the transmission from ZF if anyone wants to watch it…
http://www.youtube.com/watch?v=cd10wif87Qk