But it should be fine, as long as you set up your box correctly. To see if it's setup correctly, try giving it an entitytype, and moving a sphere into it, and seeing where it stops, to see the boxes boundaries.
How do I set up my box, do I have to create a cube and hide it? My town is a small object consisting of many tiny cubes and other shapes. Right now you have to click on one of those cubes, but I'm hoping to not need to do that - so you could click anywhere in the vicinity of the town (within the boundaries of the mesh) and pick the object. I hope that made sense :P
Speaking of my towns, does anyone know how to make it have hard edges for the 3d model? Right now it defaults to soft edges and it looks terrible.