I'm pretty sure the answer is "no", but maybe I missed something.

I'm trying to automate the creation of animations. The most cumbersome part is manually drag selecting the Collect Clip bar to choose a frame range. For example:

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There appears to be no way to set the start/end to a given frame, other than dragging and hoping you do it right. I was hoping the API could help me either to:

• Programmatically set the Start/End of the Collect Clip.
• Trigger the "Add MotionPlus to Library" action on the selection.

There appears to be no way to set the start/end to a given frame, other than dragging and hoping you do it right.

Not sure about API, but you still may do it with frame precision.
It's a bit tricky at first, but easy to get used to.

57% of original size (was 882x308) - Click to enlarge

Yeah, that's what I'm currently doing to export motions. Doing it once is no big deal, but having to do this once per motion, every time I change something, gets pretty slow and tedious. I was ultimately hoping I could use the API to auto-set the start/end range of the Collect Clip track based on the currently selected clips. But it just doesn't seem like the API has much/any Timeline interaction.