A6 slush box was Tiptronic, like the SQ5, and had a sport mode which delayed up changes to keep the engine in the usable torque range for longer and improve response but still not a patch on the manual.
I am bemused by the popularity of auto boxes in the UK now and find it interesting that in the US, land of the corner less freeway and almost universal auto box fitment, BMW offers a manual M5 super saloon due to customer demand which UK/Europe does not get. Sell quite a few of them according to one Florida dealership I have been to. Audi no longer offer a manual RS4 in the UK despite a significant proportion of the buyers of the previous model specifying manual transmission.
I have heard stories about management of torque by gearbox internals/clutch being an issue with manual box but R8 can be specified with manual as can Chevrolet's Corvette in the US.
See I was a big 'manual man' - then I drive BMW's 7 speed DCT (135i). It was AWESOME! Never missed having the stick with that car for 11 months...
Then I went back to a manual (Toyota MR2), and realised I had missed it a little bit, but the DCT was so good it didn't matter.
Then I went slush box (SQ5), now given pre-135i I would have NEVER entertained the idea of a slush box this choice at least says some modern autos are MUCH better than old, the 8 speed ZF, with the right programming is a peach - Audi got it really right in all the guises I've driven it in (SQ5, A6 Bi-Turbo, RS6). In the BMW X5/6 it's AWEFUL though, and it's the exact same box, just with BMW programming! And the Merc 7 speed slush box is even worse - so there are still ones to be avoided.
Then I went back to the manual MR2, and REALLY enjoyed having stick back, which showed the Audi programmed 8ZF while probably one of the best slushes, is not as good as a DCT/STronic.
I am now 6 days away from my Audi S1 (which BTW is 6spd manual only!), and I'm really looking forward to it, however, the Mrs Octavia vRS DSG is also coming in 6 days and I will exclusively take that on long runs based on the gearbox...
All in all, I will happily take any of a manual/DSG/Slush in the future, but a slush will have to be a damn good one, and I will only have a manual if there is a DSG/good slush on the drive for long haul...