If you need a clock or countdown timer in your iMovie video, you can create one in Keynote and export it to use in iMovie. You can manually create each second as a slide, or use this simple script to add all of the slides automatically. In iMovie you can adjust the size, color and even reverse the overlay to count down or up.
By using a Shell script in an Automator Folder Action you can create a "drop zone" folder that moves any file placed into it. By using a Shell script it is easy to add new conditions and destination folders.