It might be worth considering another plugin like http://wordpress.org/plugins/wp-supersized/ Otherwise I guess you might end up having to change the plugin (perhaps forking it on Github?)
https://github.com/Myatu/Background-Manager-WP/blob/269fb907d652ac78e3f9fb0a402375f06ac449f9/resources/views/pub_footer.html.twig
(Just realised your thread is related to another thread with more contributors: Display alt text as tool tip on page)
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