Allow carousel to stop scrolling when nothing new will show

[catkeck]

Currently if the carousel has scrolled to the last slide, and you are showing several slides at a time, you can just keep scrolling until that last slide is all the way to the left. It'd be useful if you had the option to let it stop scrolling once there are no more slides to show, for a better user experience.

So, stop here:

instead of: (or is this already possible somehow?)