The remote start feature on the Compustar system, which is designed to be used with manual transmission cars, circumvents the manufacturer clutch switch operation. From memory, you put a relay in line with the clutch switch so that the alarm can short circuit the switch when it is attempting to start the car.
When remote start on a manual car is enabled with a Compustar alarm, there is a procedure to follow in order to even enable the feature each time you want to use it. If you pull the key out of the ignition with the doors closed, the car will stay running and this enables the feature.