We made a 14x14 city area that had a fair amount of open area and everyone still got lost in it. You as the module creator will be able to dictate the spawning of creatures. By default a creature which is placed in the module and then slain will not respawn. If you go into the encounter and set it to respawn after a finite time or on some condition then it will repsawn. Each area is built using a tile set based on a specific theme.
Painting is done by simply dragging the mouse over an area.
Select the pit tile and paint away. Paint a path tile across the pit and the map editor will automatically build a bridge. Drop a temple tile into the pit and bridges will automatically extend from it where a road might normally be. Features such as trees, a pile of crates, and rocks may also be added to an area in much the same way. One example given so far is that you will be able to assemble a sword from a variety of handles, cross-guards, and blades to form a unique looking weapon.