A simple way to parent keyframes to markers
You should be able to link any keyframe to any marker in a comp, in the same way you can link/parent layers to one another. There are ways to do this using complex expressions, but a simple pick-whip style tool to quickly link keyframes and markers would be an absolute game-changer. Especially for complex files in need of frequent revisions.

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Jeremy Dance commented
Yes please! This would save so much time. Like was mentioned before, it is possible with expressions, but really bogs the project down. Linking keyframes to a marker would be a game changer. Perhaps the marker (and the keyframes) could have a color to denote they have been "linked"
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dris toumi commented
yes it would be very useful ⭐️
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Yann Gall commented
I was thinking of that too, that would be incredibly useful to be able to move multiple keyframes from different layers all at once, without having to first select each on of them! Much needed