This PR extends the existing `Ease` operator with a sharpness property. This means it has two parameters: * Curve Bend: Define which key to favor. At 0 it's exactly between the two keys. * Sharpness: Higher values make the change more abrupt. During modal operation it is possible to switch the slider between those two by pressing `TAB`. Pull Request: https://projects.blender.org/blender/blender/pulls/117287