Since Cinema 4D R13, the options for newly created keyframes can be found in the Project Settings.
All pertinent keyframe interpolation properties can be defined here when new keyframes are generated (using the red buttons in the Animation palette). Note that keys will be created with Interpolation set to Spline to preserve the existing FCurve shape if they are created while pressing the
If a keyframe already exists, the existing keyframe’s interpolation type will be maintained when a new keyframe is recorded (only the Value Key will be overwritten).
You should already be familiar with the following options from the Key Properties:
See Lock Time.
See Lock Value.
See Breakdown Color.
See Key Preset.
See Auto Tangents
See Remove Overshoot
See Break Tangents