Nice! Glad it works for you. I suspect that a lot of people won't be using Flickr for everything because of NSFW photos that shouldn't live off the hard drive. That's certainly a concern for me.
I'd definitely emphasize this: "a better Mac/Windows/Linux native app would go a long way for power users" is a huge one. Right now the OS X version doesn't simply default to intelligent settings, which is bothersome: it should start uploading as soon as a photo is selected (along the lines of Instagram).