Could you post your feature request here: http://feedback.photoshop.com/photoshop_family please?
So that, everybody could vote on it and we could follow the evolution and the status of the thread!
And I will be the first to vote and add comments
Have you experimented with the Script Listener - observing what is produced when fiddling with the timeline? I was going to eventually want to learn how to script certain things in the timeline myself, but haven't yet got around to it. When I looked into it not too long ago, I saw pretty much nothing about the timeline in the photoshop js scripting guide.