For example, let’s say the homeowner thought they smelt a gas leak inside the home, so the homeowner shuts off the gas at the meter. Would the gas company have a way to know that the gas was shut off at the meter and possibly send someone to inspect?
Most new appliances do not have pilot lights so if they are not being used there is no gas usage. Shutting the main off even during the time the meter is being read won't trigger an inspection. In Earthquake prone areas some home owners have a wrench attached to the pipe so if there is a concern about leaks the main can be quickly turned off. I have never heard of any problems from turning the main off.