I don’t think this has been suggested before so…
Something annoying to me is when i want to slow an animation by adding an in-between and i have like 10 frames after the part i want to in-between and i have to edit every frame after it until i get to the frame i want.
Maybe there could be a keyboard shortcut like control > or < for right or left and it creates another frame without deleting the other ones.
We could also double tap a frame and a menu will pop up saying something like " add frame to the right of this frame" and " add frame to the left of this frame"
This will make the in-between style or whatever its called so much easier