Animation rigging tool, IK arm follow body/opposited IK option?

Hi,
First, I love the tool. It is great.
My question is, I am not sure if the rig itself have IK arm follow world/body/opposites IK function? I can only see the option for FK, but no IK?
It will be supper helpful if IK arm can have the option to choice following those 3 components.

Rex Chao