[lowfighter]

Bee, the only way I know to have trees in towns or villages (or more generally CLOSE to other "normal" objects like houses etc) is by placing the treeline object in map mode builder. Under forest=3 that treeline appears like the the trees which you showed in the shot above.
Sure you can have more trees in the OPEN fields by using either texture.tree.tga's or by using a certain rgb on map_c (tab flettner discovery).