I want to enable links to the Picasa Web Album interface instead of direct image links, but I came across the same issue. As I have Google+ account, if I enable Picasa Web links in my pictures, then they will link to Picasa BUT then redirect to the Google+ link of the entire ALBUM, NOT the individual photo. So people click on a picture and they'll find themselves on the entire album with no instructions on how to see the picture they clicked. And if you click on the "return to Picasa" link, then you'll go to the Picasa ALBUM link. Yet again, users cannot see the picture unless they browse the gallery (tough if you have hundreds of photos on there).
So I was playing around with the URLs and the "?noredirect=1" attibute, and found out that if I add it before the image code, then it works and everyone is directed to the Picasa photo interface instead of Google Plus.
For example, the plugin will throw this link:
Then as I'm on Google Plus, you'll get lost in my album. But if I go to...
Then it goes directly to Picasa and the user doesn't have to do anything but click the link on my site.
However, this won't work if you put the ?noredirect=1 at the end of the link ( https://picasaweb.google.com/104672279851481707377/LosSims42#6043815311423841570?noredirect=1 )
So, could the authors consider changing that little part of Picasa linking? Because the way it's currently implemented is useless if you're on Google Plus.