Ability to "pin" keyframes to the sequence, as opposed to the clip
This would function so that a keyframe is tied to the sequence, as opposed to it's place in the clip.
It would mean that the slip tool would move the contents of the clip back/forward, but the keyframes would maintain their position relative to the global timecode.
I would mean we could set up an animation to occur at a specific time, determined by other things happening in the timeline. Then, if the clip needs to be adjusted, the animation remains where it was, so we don't need to move the keyframes back to where they need to be.

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Andreas Lukas commented
Please have a look at this post: https://adobe-video.uservoice.com/forums/911233-premiere-pro/suggestions/41647414-responsive-keyframes-ability-to-stick-keyframes
I think this could also solve your problem!?
If you like it please also vote for it. Thanks!!
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Matyáš Levíček commented
It is alredy there! Just use the track keyframes instead of clip. To do this, double click the track and in the diamond icon select track keyframes! (But YES it only works on audio)