AccuRig - drag and drop templates for Cloned hand, leg, head, foot, neck and arm parts to keep Biped compatibility but can IK any part
For fast iteration, have a scrollable part list of common Human, animal and creature bone configurations. These parts would be all normal CC bones but more than one of the same templates would designate the character a "Multi-Ped Hybrid HIK Character" etc
Some hand templates with finger joint modification could be used for Octopus suction cups like my attached example.
Some other Bone template configurations could be for fantasy creatures, or aquatic creatures (hand/finger joints set up as Gills)
As long at there is a t-pose some where on the character, it will be compatible with Human animations and mocap. Parts such as hands don't need to be attached to arms for body mocap or human animations, the system just needs hand mapping.