Estimating what new handle will affect
It would be nice to see some sort of an area of effect when it comes to putting new handles on the puppet. For example, we can take the "blank" puppet and put handle for breathing behavior Right in the middle of "Ch" logo; the puppet will breathe with the chest. But if we move it slightly below "Ch", it will breathe with the belly. It would be nice to see some sort of visibility that would be affected when putting a trigger or adding behavior. Right now the only way is to jump back and forth until it works.
Currently, you can enable the Show Mesh button at the bottom of the Scene or Puppet panels to see how handle placement affects the density of the mesh.