You don't need to fold your mirrors. Also put your mirror adjust switch to passenger side and it won't do the "over dip" (points at whatever you just ran over rather than what you want to avoid running over)

I set my seat memory 3 to have both mirrors point down aiming at curb a few feet behind the car.

As far as folding; just don't use it. I'm pretty sure you could use a shim in just the right place to snug up any wobble and to keep anybody from accidentally using the feature unplug the button

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)