Yes there is, we recommend this plugin -
which will allow you to reorder the posts/features/boxes etc in to which ever order you want. You can literally drag/slide the posts in to the correct order.
The size of the features box will be determined on the size of the section you place it inside. You can control the height of the section, but the width will stretch to fit inside the section. You might be able to adjust the width using css, but text or other content won't wrap around the slider. If you're looking for that you might be better using the carousel from the demo>tools> page or a third party plugin.
Hope this helps