A folder can be set to show images as a slide show, and the video does not provide enough options to expand on this.
The thing is, I am not sure what this program is really for. There are also a host of more technical options allowing that let you select the format of movie you want and the codec it will be rendered in. You can select how many frames you want the video to last, how long individual images will be displayed, and the resolution for before you render the video for play. MovieMaker does have some handy features before you render the final movie.
Indeed, I found it easier to reorder / re-tag images in the original folder rather than trying to edit once in MovieMaker. Unfortunately, the complexity of this actively discourages you from experimenting. There are some complicated controls to help manage this if you want to make some changes to the default movie (a splash screen filled with hot-key commands is on hand to help with this).
