That sounds like a great idea for a mod! Binoculars could be a useful tool for players who want to have a closer look at distant objects, fields, and equipment in the game. Having a separate category in the store for purchasing binoculars would make it convenient for players to access this tool.
The control scheme you've proposed also seems intuitive and easy to use. Holding the Left Mouse Button to look through the binoculars, and using the "=" and "-" keys to increase and decrease the zoom levels, respectively, would provide players with flexibility in adjusting the magnification based on their preferences.
Overall, this mod could enhance the gameplay experience by offering players a new way to explore and interact with their surroundings in the game. It would be interesting to see how players utilize binoculars to scout fields, identify machinery, and immerse themselves in the virtual world of the game.