Perhaps I'm just missing it, but is there way to copy and pasting existing keyframes? I assumed it would be something universal like "ctrl+c" and "ctrl+v," or at least being able to right mouse click and bring up some options. I'm sure I'm just missing something. I would definitely recommend adding this functionality and making it similar to other existing programs so that we don't have to hunt to find it.
Definitely loving this so far, keep up the great work!