Is it possible to picture scroll in full screen mode
 

If a post or topic has several pictures and you want to view them in full screen mode, you have to open one picture, then close it and open the next, close and open the next...etc etc.

Is it possible to open one picture to a full screen and then scroll to the next one without having to go back to the original post.

Depends I suppose what device you're using to view them?

On a PC you can do a right click and open a link in a new tab for each picture without closing the original screen.