When ‘Use World Ctl’ is checked on the world_ctrl is created during build, and not available for selection to add as IK Ref for any guide.
How can we add the world ctrl as a space switch for any rig component?
Cheers!
One way you could do it: Make a control_01 called “worldSpace” or something. Use that as a space reference. Then in a post script, constrain it to the world_ctl or jnt.
Another way. Uncheck “Use World Ctl”, and just make your own using a control_01. I’m not sure if that would have any unintended consequences. But then you can control it how you wish.
in the next mGear relase we have new tool called space manager. It is implemented by Elina Sievänen not sure if she is in the forum here 
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that sounds like a great helper
It’s not the Space Jumper, is it?
I don’t see her tool. How do I add it? Edit: I am on Maya 2023 mGear 4.09
It’s not out yet. If you want it now, you would need to dig into the development version.