I find it really clumsy when the coordinate system in the designer constantly resets the origin to the centre of mass/geometry. To be clear, I don't think the camera position should change, just the position of the parts within the designer. I always keep setting the command pod to 0,0,0 position because it is easier to place parts with precision and be mathematically consistent if the COM changes because of parts placement. The camera should still focus on COM by default though.
Perhaps this should be implemented under an advanced designer options menu?