Like Steve and I are trying to say - you wouldn't have to restart the engine!!! It's being turned over already, Try switching off your engine while coasting (in a manual) - notice anything different? The engine can't just 'stop' - what the hell would it do? Lock up and lock up the rear wheels? Disengage somehow and then stop, so you'd have to restart it? It's just gonna keep turning round.
Starting the car by turning the key does not do any special routine to get the engine to go - as long as it's being turned (by starter motor or the wheels), and fuel is delivered - it will go. (and ignition is on for a spark)
2.5-16v 1990 90,000m Astral Silver
2.0E 8v 1986 107,000m Black