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Looking up 7G-Tronic on Wikipedia suggests that it is a torque converter auto, though i'm not sure why that would make a difference to the problems you are experiencing as they seem to be related to the stop start and hold facilities. TBH, i am a bit perplexed about the presence of the hold on an automatic car, i thought they were only fitted to manuals to prevent the car rolling back on a hill if you fail to reach the clutch biting point in time.
We have a Honda Jazz CVT and while it does have stop start there is no hold. The stop start is something that i'm not entirely convinced by as it only works in drive with the brake pedal depressed. Not really an issue in daylight hours, but in the dark it would be very irritating to cars behind you, especially if the brake lights are particularly bright. You can switch off the stop start on the Jazz but i generally just work round it instead. If i think i will be stationary for a while, i will put the handbrake on and put it in neutral. If i think i will be stopped for a moderate amount of time, i will use the stop start (assuming it is daylight, otherwise, handbrake and neutral). If i think i will be stopped for a very short time, i will hold it on the brake, but with a gentle pressure, which won't trigger the stop start.
I think stop start systems are a good thing overall, but some are a bit too slow with their reactions, which abviously will lead to irritation and frustration followed by switching the system off. But i'm guessing that the 48v electrical systems currently fitted to various high end German cars will eventually filter down to the more run of the mill cars. These, from what i have read, react instantly. The only issue i have with it, is the fact that it only works with the brake pedal (at least with the Jazz), i would much prefer it if the system worked with the handbrake on and the car in park or neutral.
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