Help, please! Written IPO exporter. Need additional markers for SFX.

Hi folks,

I’ve written a simple movie exporter allowing me to export scenes to the iPhone.
I’m trying to extend its functionality so that effects or particles can be triggered via events of some sort in the timeline.

Any suggestions for properties or markers that I could label in the timeline, and then parse in some way as I export? I’ve looked into Markers a little, but I don’t see any references to them in the API documentation.

I’d rather not add specifically named dummy objects and then abuse their IPOs, but this is what I’ll do if there’s not a better way.