It would be great to have the ability to choose images inserted/attached in an article/post display as a slideshow (buttons to move to next/prev image and swipe on mobile devices).

That way all the images would not be displayed as a bunch of thumbnails but just one image (slideshow).

Clicking on the image in the slideshow would open the normal full screen lightbox.

I think this shouldn't be a huge task but would be a great solution especially for mobile devices where there is little sense to have many thumbnails taking up space.

Check out Albums by @onlyME in the Marketplace.  

Found it. This user has some cool add-ons. Some should be in IPS by default.