What are some innovative uses and applications of Proso Millet beyond human consumption, such as animal feed, biofuel, or industrial products, and what are the potential economic and environmental benefits of these uses?
Have a look at this:
Article Proso Millet Starch-Based Edible Films: An Innovative Approa...
Proso millet is not great as human food or animal feed because it is low in Lysin, an essential amino acid for mammals.
Wikipedia page https://en.wikipedia.org/wiki/Proso_millet, has a section on uses and references, among them ethanol production (1,2)
1. Rose and Santra, 2013, Proso millet (Panicum miliaceum L.) fermentation for fuel ethanol production. doi:10.1016/j.jcs.2006.06.009
2. Taylor et al., 2006, Novel food and non-food uses for sorghum and millets. doi:10.1016/j.jcs.2006.06.009
A simple scholar search will result in many papers on the subject