Both original handle types are based on location, and Absolute uses it in a weird way: the Start handle uses the head, while End uses the tail. This makes controlling the shape of the B-Bone via control bone rotation really non-intuitive, especially if trying to add a single control for the tangent in the middle of a B-Bone chain. To remedy this, add a new custom handle type that uses the orientation of the control bone, while completely ignoring location. It is even possible to control both ends of one B-Bone with the same handle bone, resulting in an S shape. Reviewers: brecht Differential Revision: https://developer.blender.org/D3769