Comes with an editor (But the start position is hard coded - so don't break it). It can't cope with anything much more than 2x2 so don't do anything massively complicated. Stick to corridors ;-)
I do plan to make it cope with far more complex dungeons and also more sophisticated views and movement options.
My bigger picture plan is to have Wilderness Travel, Towns, Dungeons etc.. and have a central server that means you can meet other people when exploring.
I may share the .capx but I'm a bit embarassed that my methods might be a bit crude! But then again, it would be nice to see if anyone would have done it differently.