iMovie Format Issues..

Hey there - I'm fairly new to using a Mac, but not to digital video editing.

All I need iMovie to do is reverse a three second clip. Now, it says in the help section that it can't reverse a PAL-format clip. So I converted the clip to a Quicktime NTSC format using the 'Share' option. I have tried importing it back into the original sequence I modified it from - still no reverse option.
I've also tried creating a new project, and using that to reverse the clip, but for some reason, iMovie always makes it into DV-PAL format, no matter what I select it to be saved as...

Not even sneaking up on it and quickly hitting ⌘r seems to do the trick!

ANY help with this would be awesome. I basicaly need to know how to tell iMovie to make it either a MPEG-4 file, NTSC, or whatever I need to do to get this reverse shot!