the remote start alarm i have has a protection for both manual and auto.
With auto, it only starts in neutral... and for manual, it works where it only works when your car door is shut and the system is armed while the car is still running (turbo timer feautre).. and if it detects the doors are opened, remote start wont work... so if no doors have been opened, it must still be in neutral.. hence a little bit of safety.