Also I'm planning on adding a mechanism to the Move command to make it easier to set the base point of the move to the center of the object's bounding box.

For now it can be easier to use the Transform > Align command instead since it can use the bounding center within it - it does a 2D type of align using one viewport so you need to do 2 aligns in 2 different viewports and that should then do what you're looking for.

- Michael