Currently Infuse uses the first image found on themoviedb.org for the poster and backdrop (i.e. fanart) of a movie. However, sometimes I prefer other images on themoviedb.org.
Right now I have to manually save the image I want, copy next to the movie file and name the image in a specific way as described by Overriding Artwork and Metadata.
I think it would be nicer if I could view the images in the app directly, and be able to select the image I want to use—similar to how holding the trailer button shows the list of alternate trailers available.