Hi! I just posted my gadget from the hackathon on VPT on enwiki [0]. Anyone should feel free to port the gadget (and its dependencies) to other wikis, there shouldn't be any necessary code changes, unless you port it to Commons, in which case you don't need the fancy bending-over-backwards-for-CentralAuth code.
I won't be maintaining this, it's just a proof of concept for our future work on proper, extension-y dialogs in editors, but I thought I'd share it with early adopters.
[0] https://en.wikipedia.org/wiki/Wikipedia:Village_pump_%28technical%29#Upload_...
Cheers all,