With my Accordance library on iOS and going to be on Windows soon, I'd love it if the way our library is organized could also be synced. It may sound silly, but I spent a good deal of time organizing the modules by putting them in several layers of folders. I'd rather not do that for each computer or device I install it on.
This might be difficult given that one device or machine might have only a subset of the other. Another difficulty might be how to resolve conflicts between two devices that have different library organizations.