Hi Nat,
thanks for taking the trouble, but I fear I must contradict. All the other still images I am using look good. And cropping and then filling the screen is obviously the same as zooming in.
I hope the programmers are reading this. Automatically resizing an imported image is not a good idea. The decision should be left to the user.
In case someone wants to know what I did in the end: I split the original image into pieces of 16:9 ratio, put the top part on track1 and the second part on track 2, then scroll them both: The top part from Y=0 to Y=-100 and the bottom part from Y=100 to Y=0. When the the top part has left the picture and the second part fills it, I repeat the process with the second and the third part and so on. It's tricky, because you have to be very exact.