the zeroed out controls should always go back to their bindPose, as is standard rigging practice. If you want to work in a more world coordinate fashion, you’ll want to take a look at using the space switcher tool:
Create a locator, which is what will be in your world coordinate system, and make it a space for the hand. Now you can use that locator to drive the hand, and type in whatever exact coordinates you want for world space.