IK/FK control options
First thanks for sharing this rig for everyone to use.
Do you have any plans to add IK/FK snapping to the rig?
Something that seems common in rigs, is having the IK values as sliders. Is there even a need to use values other than 0.0 or 1.0? Wouldn't it be more user-friendly to have these as checkboxes so they are turned on/off rather than some in-between value? You could use either custom properties or `bpy.props.BoolProperty` to store each option and have `1.0 if var else 0.0` in the drivers scripted expression.