it doesn't seem to be possible to select slideshow intervals individually per slideshow, right?
You mean assign different slideshow time interval for each image in a gallery? Sorry, no not possible.
ed_f wrote:in settings > popup it says "Assign a unique transition for slideshow play mode. With "inherit", the same transition will be used as in main settings." isn't that the main setting? I'm a bit confused ...
You are speaking of the transition for slideshow play mode. By default, when set to "inherit" it will use the same transition as when you navigate, but here you have the option to instead assign a different transition when in "play" mode (autoplay).