Just another idea:
If someone in the future has the time/ability to insert this, it would be great to have an addtional track
(like the marker track) where one can set a marker + add text that reappears with mouseover at that marker,
just for remarks or notes about what exactly has to happen at that marker in time.
Or maybe even adding a track in which one can visually draw animation markings and how movements are meant to be drawn,
like in an x-sheet. (Drawing with a pen directly on a marker track, like on a tape strip). Great for timing.
Thanks.