Providing you specify folding door mirrors in the options, you can make your mirrors fold/unfold when turning off/on the ignition, with a simple adjustment in the MMI. No need for extra cables.
Have Audi listened at last?
Finally! Nice to have the option now. As previously stated I prefer to leave them manually operated in case of problems with icing conditions leading to possible freezing up but as the facility always was there it was daft not to provide means of enabling the feature without having to resort to VCDS or similar.