Wow, what an awesome plugin! I have been looking for something to do just what yours does! I found it through this nextgen-gallery.com article.
I run a website with a very LARGE Nextgen Gallery consisting of 967 Galleries with a total of 41126 Images.
I am reluctant to run the Bulk NextGEN Gallery Optimizer function in case there is an issue or what not. I would like to do something similar to the WordPress media library by selecting a few galleries at a time and bulk optimize only the selected galleries.
Is there any way to do this? I found your response in the "optimize wp theme" thread about running the FAQ command via a script. I see that the command is written for an individual file at a time. I am very new to the coding world so, do you have any advice on how to create such a script, if the above option isn't available?
Thanks so much in advance for any advice you can give.