I was able to get the pedal assist going. It didn't seem to fit the crank properly, but after a second try it slid on.
The shifter worked out too after I moved the mode switch for my LCD display to the right handlebar. I do like the rapidfire shifter approach, and the gearbox shifts reliably now.
All in all this was a great move. I had big problems with the single speed not giving me the type of exercise I wanted. Instead of the 38T chainring, I put the 46T on. That gives me 46 -- slightly easier than the default RadRunner 53 -- and a 66 for my second gear. Then when I shift to 3rd, it is 82T which gives me a good workout and gets me going at 15-20 MPH on PAS 2 depending on the wind and incline.
I am a flat-ground rider, since I am either in Illinois or Florida. If you have hills to deal with, I am sure the 38T would make more sense. For me, 46T works real well at PAS0 when riding in areas where I want to go slow, and th 66T works well for PAS1 or 2 on slight hills or against the wind. I can move to 82T when I am going down a slight incline or have the wind at my back. I just did a 33 mile ride today and made it back with 2 bars left on the battery.
Shout-out to Efneo and Wiktor for support. They were responsive and on target at all times. I love the GTRO. I spend time in Poland periodically, and plan on stopping by to see them and give feedback.