Its probably very difficult to add but it would be crazy if there would be more features in rewind that you would usually find in 3d software, like placing 3d text inside the minecraft world or rendering images/etc. in the minecraft world using rewind, so that they dont move with the camera and much rather like the blocks or the other stuff in the world that stays at one point in the world.
#More Rewind Features
trim leaf
latent geyserBOT
Its probably very difficult to add but it would be crazy if there would be more ...
civic mural
I think the main reason Rewind exists is to be a native Replay Mod which also has the ability to control the Lunar Features. The idea of it is to render your footage/cinematic or whatever, and put it into an actual video production program