The Scouts 4 WordPress theme displays a 960x360 'featured image' on the Main Index page using the Content Slide plugin and if there are multiple images configured they will be rotated through, or randomly chosen. This design feature has been adopted as an option for the Scouting Challenge theme but it has been implemented somewhat differently.
In the Scouting Challenge theme it is known as the 'Slider' and it can be displayed in any page template subject to there not being any sidebars being in use (you can call it but it will look a mess). You may only have one Slider on each page so once you have called either the Slider or the Slider-Tabs module any further calls to the Slider or Slider-Tabs modules will be ignored.
Version 5.1.0 of the theme introduces a sidebar named 'Slider'. If you drop a widget into this sidebar it will be used as your slider. So the theme can support any slider plugin that can install the slider as a widget. It is actually entirely up to you what widget, or widgets, you install in this area. You can use it for something completely different if you want to and you aren't limited to a height of 360 as the sidebar is simply a
<div> and will grow with the content. This sidebar isn't called in the Slider-Tabs module.
The Content Slide plugin is very tedious to configure and a bit of a sledgehammer to crack a nut but for compatibility with Scouts 4 WordPress the Slider will use it if it is configured and there isn't a widget. It isn't particularly encouraged, and indeed the plugin is no longer easy to get hold of, but the choice is yours.
The Slider has its own built-in functionality for displaying random images, and automatically changing them every ten seconds (this interval is a configurable option). This is implemented by using the WordPress Media Library and two custom taxonomies. This makes it much easier to configure than Content Slide. There may be times when you want a particular image to be shown first, perhaps to highlight an upcoming event, and this is supported too. This doesn't have to be one of the pool of random images.
There is also a fallback option for when neither the sidebar or the Content Slide plugin are in use, and there aren't any images flagged in the Media Library. This uses three brand images included with the theme along with the configured URLs associated with them. These brand images probably aren't going to be that useful on a live site as they are now a little dated, but they are useful to make sure you have a working slider while you are developing your site.
If you do wish to create your own page templates, the Slider can be included with the code:
<?php include locate_template( 'slider.php' ); ?>