Little thing I discovered
My mirrors don't auto dip when I reverse
And you can't initiate a memory unless you're in neutral or park
Going from drive to neutral then pressing recall 3 (saved as mirror dip) then reverse is cumbersome
I discovered of I press recall 3 while still in drive and then shift to reverse, it'll initiate position 3
So it's not automatic, you still have to swiftly press 3 but it's better than coming to a full stop to initiate the mirror dip
You're making it waaaaay too complicated. Once reverse mirror feature is enabled in FORScan all you have to do is add the reverse mirror position to your existing stored button. In my case button #1. So get in your truck. Start the engine. Then with your foot on the brake, shift into reverse. Press the button to select the right mirror. Adjust the right mirror to your desired position so that it is tilted down showing you the rear tire sidewall and any curb that is on your passenger side. Then press and hold the #1 button until the chime is heard signaling that the memory position was saved. You can repeat this same procedure with the driver's side mirror.
To use the feature...when you are driving your truck and wanting to activate the rear mirror position...simply select either the left or right mirror button and shift into reverse (or shift into reverse and then press the left or right mirror button -- either order works). The mirror will go to the position which you stored for the reverse position.
Easy peasy. Simple as pie.
What you're trying to do is change the mirror position as just a standard saved button which as you've noted you can't do while the truck is in motion because it doesn't want you to be driving down the road, press the button and all of sudden little 5'1" Suzy can't reach the pedals anymore because she pressed the button for 6'4" Johnny's stored seat settings.
Use the FORScan setting as it was designed and it works perfectly fine.