Awesome, I always thought it would have been cool to export walkable areas/hotspots, etc to a bmp file...very good idea!
It would be nice that as it exports, it appends the room number to the name (WalkableAreas_Room01.bmp) or something like that.
Seems if the room is very large (3072x2304, for example), the bmp file has a large black space and the walkable mask is reduced to the top left corner by 25%.
This, again, is a very good idea!!