I hate to necro this post, but consider this: there are at least 2 versions of the 6 speed DSG transmission. The original 2003 design had multiplate wet clutches (DQ250/02E) and was rated at 350Nm. The seven speed DQ200 introduced in 2008 had single plate dry clutches and is rated at 250Nm. The question in my mind, for those who have the DSG...is the 6 speed still multiplate wet clutch? If that's the case, then you have less to worry about with increased torque loads. Having several plates to spread the torque across reduces the stress on each plate, and having wet clutches helps keep them significantly cooler. If the DSG in the late Mk5 and the Mk6 is single plate dry clutch, I would be careful about overloading it...
Edit: If someone can find out exactly what the parts prefix of their transmission is, I will do some homework to find out the details. If you bought your car new, you should have a sticker (may not actually be applied, may still be on a backing) that should have been included with the owner's manual in the glovebox. It may alternatively be in the trunk near the spare. Just look for a sticker with a bunch of 3 character codes on it...should say engine, transmission, installed options, etc...