It's so hard to search emoji, which you need, if you don't know where is it.
For this I suggest to add new menu, like "Frequently used" - "Pinned".
To pin emoji you need to do right click on emoji. After right click emoji moves to the "Pinned Emojis" menu.
To unpin emoji you need to do same action (right click) at emoji pinned in menu.
Concept:

_Sorry for ugly font and icon_
For the issue with using keyboard in emoji / sticker / GIFs menu #1706:
Shift + SPACE - To pin / unpin emoji
It sounds good, but is somewhat redundant and becomes more complex user experience.
I prefer TDesktop, would enhance emoji replacement, adding a larger list or a customized list by the user. (Or use a new standardized system as LibreOffice or Github).
Cheers
@rplansky you can use the new feature to add github reactions to give its approval to the idea.
Hey there!
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Not solved yet
Agree, not solved yet.
Not solved.
There's no api for this.
@auchri there's no API to save pinned messages you've hidden on server -- but you can hide them locally.
Recent stickers were saved locally before, and iirc recent emoji still are.