4) symmetry rarely ever looks look
I once worked with a measuring instruments panel design engineer who used to say symmetry only looks nice on women, not on instrument panels.
I’d recommend using the latest Map Editor
Legend of Mir 2 - Official Public Crystal Map Editor - Suprcode/Crystal.MapEditor
github.com
If that editor on GitHub still has that 'map viewer' of yours in it, forget it. That killed it. Problem is you have never done any map editing I know of but felt qualified to remake the program to your liking.
Since we have that
Resources section above here in the forum header
why not head over and download the new map editor from there and maybe read the tips on using some of its more advanced features.
add dirt under the buildings
In case you don't know what that means, its like those muddy paths weaving through Bichon grassy outdoors. You make those by 'tile brushing'.
Go to WemadeMir2 library tab (shortcut F1) and select Tiles or one of the smTiles (smallTiles) libraries and click to select one of the tiles in the right panel. Then go to Tiles panel (T) and select one of the big tile square and go to map view (F5) where you choose to brush either bigTiles (0) or smTiles (-), then if you click on the map, it will lay down one of those large tile square you chose previously in Tiles tab section.
Brushing tiles is done by holding Ctrl and moving mouse cursor around. The editor has UnDo (Z) but in brushing tiles so many are laid down that it takes a bit holding the Z key down to undo tile brushing. Better experiment first on a new (N) map canvas. I think valid libraries for tile brushing are WM2 and SM2 (ShandaMir2) only, the Tiles (sometimes called bigTiles) and smTiles (short for smallTiles) libraries
It doesn't mater what tile you select in those libraries in the right panel, just so that something is selected to load those tiles into the Tile tab section.