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I can think of some exciting features. Different doorways or major entranceway. Sewer style maps.  Wilderness maps. Setting a % mix of sewer vs wilderness vs dungeon. Rounded rooms.   Layers with index key for each level of a linked dungeon with an icon/location to show links between dungeon levels.  Also cave / rough hewn style walls in addition than straight. Excellent work as ever!  How about adding a keyed dungeon entrance beneath buildings in your town/village generator.