In ArcGIS StoryMaps there are Briefings. Once finished making your Briefing and it is time to present all the pages, your options are click the page arrows or use the keyboard arrow keys. Adding Scroll Wheel functionality would be helpful for navigating. This may not be desired for all creators/users, maybe this can be an option at the top in the 3 dots under briefing settings. I am curious of other people's thoughts too. Maybe using a "Stories" instead is the desired workflow.