Vertical scrolling is not supported in the free version of the plugin (and will never be). It might become a feature of the pro version in the future, but is not on the roadmap right now.
Automatically increasing the number of pages would not be a good idea because as your site’s content grows, you will eventually have a lot of posts and it will be impossible to list them all in a news block. This would not be a scalable solution, and would even be a dangerous feature for many sites. So we are not planning on supporting this feature anytime soon either. The free version of the plugin must remain general-purpose and fit on any type of site, including sites with thousands of posts.