Making a knee bend in a desired way in IK setup, is as simple as just changing that bend in edit mode. But what if I want the knee to be able to bend both ways, depending on situation. A switchable behaviour set up by say a driver. Is something like this possible to achieve in blender? Should probably add that I'm not working with a leg setup, just using the knee analogy, to refer to the point between two bones in IK chain.