That's a great idea for adding realism to the map! Sewage manholes can definitely enhance the overall look and feel of the area. It's a small detail, but it can make a big difference in making the environment more immersive for players. Plus, having it as a decoration item in the store allows players to customize their surroundings according to their preferences.
Including such details can help in creating a more authentic atmosphere, where players can engage with the game world on a deeper level. It adds depth to the overall gameplay experience and can also be a fun and creative aspect for players who enjoy designing and decorating their in-game environment. Kudos for thinking about such a neat addition for the game!