Use Curves as Custom Bone Objects

Problem

When building a rig and choosing a Custom Object to display in place of a bone, Blender currently only supports mesh objects and empties . Despite this, a user can select any object in their scene as a Custom Object, including curve objects. However if they do select a curve, they will see nothing displayed.

Considering 99% of rigs display controllers as what appear to be curve objects, this is very counterintuitive; especially to those new to rigging.

Proposal

• Allow curves to be used as Custom Bone Objects

or

• Filter the list of available custom objects to only those that are supported i.e mesh objects and empties