I got it to work!
I changed the input setting in MRA from Carpe Iter BMW Controller to just Carpe Iter, and in the CI Controller app I changed the "auto detect" setting and chose just MRA.
The Wonder Wheel works as a zoom up and down control, and a quick tap to the left brings up a very useful CI menu that allows you to lock and unlock the screen, adjust the brightness and volume, etc. A quick tap to the right will change the perspective from overhead to an angled view and back.
The buttons pan up, down, left and right. Zooming with the Wonderwheel will re-center the map.
This is exactly the functionality that I was hoping for.