My auto Sport tdi is on order but I am still not sure on the exact functionality of the auto-hold function, in conjunction with the auto gearbox. I can understand the requirement on a manual but not the the autobox.
Do you mean the auto-hold on the handbrake ? If so, what it does is apply the handbrake for you when you stop, even on a steep hill, so you don't roll backwards, then you just drive away and it automatically lets the brakes off for you !!! Clever little Tig
Thats what a Tiptronic auto box does anyway - after braking on a hill you take your foot off the brake and it holds the car stationary until you press the accelerator...
I suspect the difference is in it's operation as a parking brake rather than the auto-hold which us auto drivers already enjoy. If I put my auto in park the car rocks a bit and doesn't feel like a "proper" parking brake, I'm hoping the Tig brake does as I usually park on a slope and wouldn't trust the auto-park to do the job normally.
The thing with the "Auto Hold" button is that it holds uphill, downhill, on the flat, wherever you stop. Once you stop the park brake automatically sets itself and then when you're ready you just drive off !!!! COOL !!!!