To create more natural looking animations, you can ease keyframes. The affected duration is visible in the color purple. Select a keyframe and click on the ease label to change it.
You can change the ease between 2 keyframes. When multi-select keyframe is supported (on the roadmap), it will be possible to apply easing over multiple keyframes.
This is not yet supported, but also on the roadmap. Draw your own ease curve (generates a custom interpolation between keyframes). Same as MoJS.