Basically as the title says. I'm not sure if it's possible other than recolouring a room with a vending machine (similar to monster zoos being blue and Brax' shop being pink), but I'd like to be able to easily find the rooms with vending machines in.
I agree, would be more relevant than bookshelves which you only use once (why would you wait on using it anyway?)
Aren't they movable objects? Colouring the floor might still be a fair option. I'd like to see the minimap update itself when objects on it are shoved... or better still, keep the existing uberchest icons for locked and openable, but remove the icon from the map when the uberchest is opened.
vending machines should have been visible back when they were putting shrines and teleporters on the map.
I think an open uber chest should disappear from the game once opened. There is still a bug that wont allow me to walk through an uber chest once I have loaded my game. Very annoying, making them disappear after opening and just leave the item on the ground would be a better option.