Controls: Click a building or tree cluster to select it; then use arrow keys or 'w'/'a'/'s'/'d' to move it (holding shift increases the move speed),
'm'/'n' to rotate it, 'f' to flip it, & 'Escape' to de-select it.
You can't currently move lines--but if you import it into Worldographer you can edit everything. Click elsewhere on the map to pull up a settings menu (change coast/river) and re-generate the map.
To fully edit the map: on the settings menu, copy the text in the texfield to a UTF-16 text file, like this one and save it. Then open it in Worldographer (even without a paid license) via the File menu.