iMovie ’09 is kind enough to play your video for you in your chapter markers.  But what if you don’t want to spoil the show by having your video played?  To “pause”, “freeze” or otherwise have iMovie NOT play the video in the chapter markers, here’s what you do:

1. Command + i  (with nothing selected)

2. Move the duration slider to left to 0 (zero) seconds.  You can then play around in this menu for more fine tuning.

(For whatever it’s worth iMovie and Apple call this a Motion Menu).

Happy Movie Producing!