auto inbetween generator

I have a question: I have seen some software like Cacani or Blender, they have a function that is inbetween generator, I find them very handy, with toonboom we have Morphling, quite similar to them, but not convenient for very. What do you think about this morphling function is upgraded in the upcoming version?

And, unrelated to inbetween, when I pointed to a function of a layer, I wish there was a highlight that would only be horizontal to the line I want to edit the keyframe.
thank you!

learn about Master Controller functions, I think that’s what you want.