I may not be the first to mention this, but I haven’t seen it so far, so here it is:
what about players having a sandbox dungeon, where they can test out their tile arrangements, so they don’t waste precious time/resources/nerves on silly mistakes in planning. I just took to pen and paper having this in mind, and started drawing my would-be awesome starter dungeon (once I get those Lesser stone binding tiles), when this thought occurred to me.
If not this, I think it would be mighty cool to at least issue a signature NOG – DO sample map JPEG, which players could print out or otherwise use for their planning. :)
But the first one seems much more convenient, and I find it holds similar benefits to the skirmish option, for example.