Please add Timeline Events feature. Right click on the frames → Insert → Event. I would like to script simple handlers and call them from events (like Animation Events).
Or add a special kind of track for it (like Action Track in “Slate”).
Also, your Timeline is linear. Add a possibility to return to certain frame or to loop some segment (without scripting and manual PlayableDirector.time checking)
Thanks for feedback - these are things we are hearing a lot, and will be added in future versions.