60fps Reverse Slow Motion Bug?

I have been playing with slow motion in iMovie using 60fps source footage (i.e. 60fps clips in a 30fps project).  It does a decent job but I have come across some strange behaviour when playing the slow motion clips in reverse.  It appears that iMovie losses it's nice smooth slow motion when the clip is played in reverse.  By this I mean that in reverse the nice smooth 60fps@50% clips look the same as 30fps@50% clips, they are choppy.
Take a look a this clip for an example: http://vimeo.com/27162470  (just uploaded and currently being processed by Vimeo, may or may not be ready for viewing yet)
I cannot figure out why.  Wonder if this is a bug/limitation in iMovie or if I'm missing a setting somewhere.  I suspect the former.
Message was edited by: DigitalOxygen.ca

One possible workaround is to reverse the clip before importing into iMovie but I have yet to find a tool other than iMovie that will let me do that easily.  Some quick investigation into MPEG Streamclip, Handbrake, and ffmpeg didn't turn up much. 
Anyone know of a tool that will allow me to reverse the clip before importing into iMovie?

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