[Windcatcher]

Import as ground mesh isn't all that useful. What it does is takes a ground area (say, a deformed plane) and converts it such that it will look as if you had created it from inside OpenZone. That is, the ground will be forced to conform to OpenZone's grid method so that it can be edited in the ground editor. If you're going to the trouble to create a land area in another tool I don't recommend using "import as ground mesh" since it will destroy any fine detail.

Edit: When you move through the dungeon in Dungeon Builder 1.6, the overview window will now be visible on the left side below the room texture buttons. If you click on a room (not a corridor, only rooms for now) it will immediately take you to the center of the room. It will also show a white circle that shows your current location and moves with you.