Hi
I can help you with 1 & 7
1. Very familiar with this annoying problem. Just had Software update today (19 May 2020) that seems to have fixed - or at least very much improved -the step off delay. Only driven home from the dealer but it feels much better. There was also an MMI update. Fingers crossed this is it. (NB Mine is the 50TDI Quattro.)
7. The rattle on my car comes from where the plastic under the instrument binnacle meets the binnacle. Pushing on this plastic will stop it. I notice it after a big change in internal temp such as when setting A/C to Max.