You can import jpg, gif, and bmp images just like you import mp3 or wma files. Just use tools/import.
To play a set of images, just select them and hit enter or right click/play (or show) or hit the play button on the player window.
When the built-in slideshow is active, a spacebar will toggle it off and on.
Page up and page down go forward and back.
The mouse wheel zooms in. One of the MJ options controls whether Pan is started automatically on zooming.
When zoomed, you can "grab" the screen and move the view by holding down the left mouse button and moving the mouse. You can also do this with the arrow keys on the keyboard.
The P key turns pan off and on when you are zoomed in.
The "[" and "]" keys alter the speed of the pan.
When you are in full screen, you have good control of both music and images. The control bar on the top controls music playback. The one on the bottom controls image playback.
Starting up image playback is trickier. Start music first. Then select images and hit enter. If music is playing, you can also right click on the selected images and select "show".
The easiest way to combine music and images is to make a playlist. Just drag whatever you want into it. Then start the playlist by pressing the Play button.
Right clicking on the image displayed gives you access to options for slideshow playback. Time interval, transition effects, etc.