I was able to relocate a member's address on maps.lds.org by changing the address to a more standard form. The original address on the membership record confused the mapping software, which plotted the home far outside the ward boundaries.
I clicked the Move link on the address pop-up. The Set Location dialog says: "Drag-and-drop the selected item to the correct location on the map. You can also enter an address below, or navigate the map to the correct location, and then click Start Move."
I have no idea if this changes the address on the membership record or on the Directory.
Dana Repouille, Plattsmouth, Nebraska