I'd love this too. It seems like it would make my data safer. That way I can use my backup software to just copy my PDF folder every now and then for a second line of defense (sync and multiple computers is my first!)

No expert on licensing, but there is so much potential here if there were more people working on it. Alternatively, would be happy to pay a small fee (as a current free user) for the sake of stability and features.

Even better, maybe there is a way to get hold of some of that university money that currently goes to Endnote, while still keeping it free for individual use!!