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So I have a few questions about how Krita works.
I am looking into learning to develop for Krita right now as there is a feature that I really think needs to be implemented.
I don't know that much about how the app is set up, but from what I have seen I think there might be a fairly easy way to implement animation tweening using the graph editor in the animation panel. From what I have seen the idea of animation tweening has not been discussed for the last 2 years.
If this is incorrect, please inform me, but nevertheless, my suggestion.

I have noticed that when you create a new layer, the layer preview changes size to match just the size of your drawing on the empty layer. if a layer's upper left corner was mapped to a point that is moved when using the scale and move tools, maybe the same point could be used to tween animations. If you have a picture from one frame that is moved to another location at a later frame, you could use a fixed point on that layer to tween the animation.

Again, I am not sure if this is how Krita is set up, but if it is, then I think that is a fairly viable method of creating tweened animation through the graph editor.
(thought this because the graph editor needs fixed values to modify, hence only opacity is something that can be edited in it at the moment)
this type of animation is what apps like unity use for creating smooth motion between frames in game-play, so maybe it would work here too.

If anything here is very inaccurate or way off base, please tell me, and if there is currently development on this part of Krita please link to that in a reply.
Also, I am trying to figure out how to read the file system for Krita right now and I would love some suggestions on how to do that.
(if this is in the wrong section, sorry, I'm a bit new to this forum and this seemed like the best place to put a post like this.)

Thank you,
-Gray