Using same background image for multiple slides

I have one background image that I want to reuse for multiple slides and I’m just changing the text for each slide to make it unique. When I try and add an additional Slide and pick the background image to use again I get an error saying it’s already in use. Is there a workaround other then renaming and reuploading the image again to fake the plugin into thinking it’s different? Defeats some caching benefit.

http://wordpress.org/plugins/ml-slider/