I have been putting some thought into this swap myself as of late; with my current setup, 02mq i have already surpassed the limits of my ~400lbft SBC, in FWD mode only hitting 3rd gear from a 1st/2nd spin, so i know if i were to launch hard from a dead stop in 1st, it would be the end of my clutch...which puts me on the cusp of having to think about a twin disc setup, which make me cringe due to drive-ability
I have a buddy in MN that has an MK5 r32t that has put down well north of 500+lbft to all 4 wheels thru the DSG; they went thru several rounds of upgraded clutch packs made by various vendors, only to land back with the OEM clutch discs, then refined the programing.
From a power holding standpoint i have confidence in the trans and its power holding capabilities; i am not intimidated by the electronics, there are always ways to "re-code" and "code out" things such as ABS, ect, (this should be no different than coding out the ABS/WSS from an mk4 cluster, which was started by the mk1/2 guys doing engine swaps, and since gone mainstream by the mk4 fanboi's shaving bays) especially with the current capabilities of tuners such as Jeff Atwood at UM and i know Malone does some tuning for the TDI DSG.
My main concern at this point will be going to spend a slow saturday afternoon down at the VW deal with my buddy and browsing ETKA to find out if the bell housing from a TDI and meat and potatoes of an mk5 r32 trans will mate up and allow me to keep my AWD functionality...
not sure when i will be able to dedicate that kind of time...but it is on my list of things to do...