Overlays: There would need to be a way to toggle the drawing order of overlay and door. I'll take a look at it.
Zones: I added 8 more zones, but forgot to enable them in Step Event dialog. I'll fix that.
Backdrops: Show distant backdrops is for the situation where you have a wall with a window on it. Usually you see the backdrop for the square where you are standing. When you look out the window you want to see the backdrop for what is on the other side. If you turn on Show Distant for the square on both sides of the window, the backdrop on the other side will show through.
Quests: I just spent twenty minutes writing ways to diagnose the quest situation, and then I remembered why you are seeing the quest variables
They only show up when you run the engine from the editor, just while testing it. If you start the engine separately, you won't see quests - only special items/keys. You have the right idea with the text event too. Give the party a quest (automatic-no text) and then check for Quest not present before displaying the text event.
Combat: Characters showing up in inaccessible parts of the map is a tricky problem. I use the pathfinding code to make sure that there is some way to reach every monster placed on the map, but I don't think I use it for placing party members. I'll try to improve it.
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CocoaSpud
Dungeon Craft Development Team
http://uaf.sourceforge.net