I like to insert several Images in a Post. For each Image I have to click:
-> Add an Image -> NextGEN Gallery -> Select Gallery -> Show (Image) ->
Insert into Post.
And then the Script closes and I can't add another image of the same gallery into the Post. So I have to repeat each single step.
That could be more efficient.
The Flickr Photo Album for WordPress Pluginhas a "close after inserting photo" check box that you can uncheck to add more pictures in one go.
That would be great to have in NextGEN