I'm hoping to add this in 1.1 or 1.2 (the next two releases). Do you have a format you'd prefer to integrate animations? I've been thinking GIFs since making a whole timeline editor seems to complicate things beyond HONK's ideal simplicity.
I wouldn't bother writing an entire timeline animation editor, loads of programs already do that. maybe have it look inside a folder that's named correctly, such as "myCharacterCheerAnimation" and just play the jpeg/png format in sequence. Though, for simplicity's sake... GIFS or a MP4 seems to be the fastest way to achieve the desired goal.
