I've been able to significantly expand the number of ways you can view images. In addition to viewing them one at a time, you can view all the images in a folder arranged as a row or a column, and can immediately switch between these options by selecting the appropriate buttons (aim the controller and pull the trigger) while File Mode is active.
You can also choose whether to keep image sizes relative to each other (so if one image is half as large as another, it will always show up accordingly) or resize the images so that they have either the same width or the same height. These options can also be changed around in File Mode.
Lastly, I fit in the ability to press a button to move the image or video back to the default position, and also added some buttons while viewing videos to control whether videos will loop or stop when they reach the end.