Make a window that will allow me to choose which icons appear on the map. I'd turn off bookcases all the time, but wouldn't mind an option to turn levers on as needed. Also would probably turn off teleport tiles until I finish exploring a level. Of course, the ability to easily add custom map markers to the map would be awesome! Just 5 or so different icons that we can move around and toggle at will. While I'm suggesting map changes, some larger resolution icons would be nice The ones we have don't scale well to larger map sizes.
At this point, I feel like there's so much stuff for players to remember that the game might benefit from having a detailed, full-screen map that can be pulled up at any time.
While I've already listed everything I'd like to see on the map in another thread, http://community.gaslampgames.com/threads/things-id-like-to-see-on-the-mini-map.2314/ I must say this whole idea of adding our own markers would handle much of that as well. I'd love to be able to stick a colored "pin" on the map to tell me where my pile of craftables is, and another one to remind me where the grill is, or where I'll find that vending machine with the squidbolts I couldn't afford yet. If they added your custom map marker idea, I'd be thrilled.