I have been emailing Travis, and this extension is now ready to go I believe. It
searches among both CC-BY and CC-BY-SA images. It prompts the user for a dest
filename and appends a random number to that (because most people won't write
anything new, and many names will have nameclashes otherwise). It searches both
tags and text on Flickr. It imports the largest version of the image available.
In short, it has all the functionality that we require.
This extension would be hugely useful to Commons because we currently have a
major problem verifying Flickr licenses, because Flickr users can change their
licenses after the fact, so sometimes we can't tell if a Flickr user has changed
a license or a Commons user has made a mistake. We have a major review process
involving bots and admins manully checking things.
If we had this extension, we could at least stop the review process for all
images imported using it, because we could be sure about the license. It will be
a huge improvement.
Everyone who has heard of this extension on the mailing list or Village Pump has
been enthusiastic about it.