Professional :: CS5.5 JSFL: Timeline.convertToKeyframes() Doesn't Work With Motion Tweens

I'm writing a JSFL script to export animations from Flash. I iterate through every frame in the timeline, and for each frame I go through every element in every layer, and write each Element's symbol name and matrix values out to a file. The problem is, if you've created animation using a motion tween, the exporter steps through every frame but sees the same matrix values for each Element in every frame. This is where I hit the first problem: Iterating through the timeline in this way doesn't seem to work. I can't see any way of getting the right information out for each frame.

There is a workaround: Namely, selecting all the animated layers on the timeline, and selecting "Convert to Frame by Frame animation" from the context menu. Then you run the exporter, and then you have to undo the "Convert to Frame by Frame" animation in order to continue working on the file. That's pretty messy, so I tried to automate the process, by having the export script perform the convert to frame by frame. When you perform the action, and look it up in the History window, Flash tells you that the JSFL command it used was the following:

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