You can set a default image and settings and then change the image and settings for each screen. If you want a screen to act as a slideshow you can set it as an album or folder screen and then set the selection order. If you have double tap to change turned on you can change the image just by tapping on the screen. No more opening a gallery app to show off your pictures.
If you use a home replacement that lets you disable homescreen background scrolling make sure you turn that setting off so that the images will change when you change homescreens.
This app does increase battery use, but I can still make it through a full day with my phone. YMMV.