This app was mentioned in 3 comments, with an average of 2.67 upvotes
You can set a non scrolling image, I have used it for years without issue.
You can't by default (thanks google). You need a 3rd party app like https://play.google.com/store/apps/details?id=com.twistedapps.wallpaperwizardrii
or exposed script
Crop the image?
Edit:So looking into that not sure if that works, but I found this https://play.google.com/store/apps/details?id=com.twistedapps.wallpaperwizardrii