Dre1973 - perhaps I'm not as doddery as mcmaddy thinks I am then......(incidentally mine was a Ford too).
If your car is still running or engine is off due to stop start and you try and lock the car it won't allow you to lock it so you'll then know if something's wrong. In fact I'm sure if you open the door with stop start in operation it beeps at you.
It's not more likely to be nicked if you take some minor precautions - Faraday Pouch.Keep your keys in your pocket - why would you want something rattling around while your driving.Runs down what battery? In the fob? So does a non keyless fob.What's off or on? Your car? Maybe shouldn't be allowed out if you can't tell your car is off or on.Only costs you money if you spec it.