meh. I tend not to use those scripts for simple inner and outer shadows

For either...
- make a selection of the room shapes
- create a new layer, white for outer, or black for inner
- fill the selection, black for outer, or white for inner
- add a layer mask from selection, invert for outer (going from memory - that might be backward)
- selection none, then click on the layer to make it (not the layer mask) active.
- gaussian blur to 2x the size you want the shading
- optionally adjust the levels, opacity, or layer mode.

-RobA>