How do we get Micro-Nudge to move in smaller increments?

Our micro-nudge is set to the smallest increment possible, but the incremental movements are still too large when repositioning objects or individual nodes.  Interestingly, we can make very fine incremental adjustments from the X-Y Coordinate docker (at least 3 decimal places).  Unfortunately, changes from the X-Y docker can only be made to one objects or node at a time.

How do we set the micro-nudge to a smaller incremental movement so we can precisely reposition or resize single and multiple objects with the arrow keys as needed?